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Super Regeneration Detector
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Super Regeneration Detector
RC Circuit response to different input voltagesNPN transistor to short RF remote switch buttonWhy am I losing the signal when I attach this RF amp circuit and how can I correct it?433.92 Noise Is Different Across The Same Type Of DevicesHow to measure EMI without special equipment?RC controller design for small carHow to identify a component on a board?Electric circuit diagram proof check - simpleHow does this Pierce Oscillator work?How to stop erroneous signals on startup of an RF circuit
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$begingroup$
This is a circuit for a remote control toy receiver. Can someone help me understand this. Connecting the antennae to the collector makes no sense to me. RF is my weakness.
Datasheet where this came from is here, page 617.
http://www.bitsavers.org/components/samsung/1990_Samsung_Linear_IC_Vol_1_Audio_CDP.pdf
simulate this circuit – Schematic created using CircuitLab
rf remote-control
asked 8 hours ago
Mattman944Mattman944
1,5201 gold badge3 silver badges11 bronze badges
$endgroup$
add a comment |
$begingroup$
This is a circuit for a remote control toy receiver. Can someone help me understand this. Connecting the antennae to the collector makes no sense to me. RF is my weakness.
Datasheet where this came from is here, page 617.
http://www.bitsavers.org/components/samsung/1990_Samsung_Linear_IC_Vol_1_Audio_CDP.pdf
simulate this circuit – Schematic created using CircuitLab
rf remote-control
asked 8 hours ago
Mattman944Mattman944
1,5201 gold badge3 silver badges11 bronze badges
$endgroup$
$begingroup$
First spend some time reading up on the whole idea of regenerative receivers; what they do is a bit odd. You probably wouldn't want to do this today when there are 2.4 GHz digital packet radio modules like nRF24 clones comparable to (and in some cases interoperable with) what high end RC sets use available for $1 each.
$endgroup$
– Chris Stratton
8 hours ago
$begingroup$
@ChrisStratton - My brother has a bunch of these from the 90s. I am helping him to get them working again. He says that although they are cheap, they were really fun to race. We believe that caps have degraded. The throttle is frequency modulated and works. The steering is duty cycle controlled and doesn't work.
$endgroup$
– Mattman944
5 hours ago
$begingroup$
Then the problem is likely with the decoder circuit not the regenerative detector
$endgroup$
– Chris Stratton
4 hours ago
add a comment |
$begingroup$
This is a circuit for a remote control toy receiver. Can someone help me understand this. Connecting the antennae to the collector makes no sense to me. RF is my weakness.
Datasheet where this came from is here, page 617.
http://www.bitsavers.org/components/samsung/1990_Samsung_Linear_IC_Vol_1_Audio_CDP.pdf
simulate this circuit – Schematic created using CircuitLab
rf remote-control
asked 8 hours ago
Mattman944Mattman944
1,5201 gold badge3 silver badges11 bronze badges
$endgroup$
This is a circuit for a remote control toy receiver. Can someone help me understand this. Connecting the antennae to the collector makes no sense to me. RF is my weakness.
Datasheet where this came from is here, page 617.
http://www.bitsavers.org/components/samsung/1990_Samsung_Linear_IC_Vol_1_Audio_CDP.pdf
simulate this circuit – Schematic created using CircuitLab
rf remote-control
rf remote-control
asked 8 hours ago
Mattman944Mattman944
1,5201 gold badge3 silver badges11 bronze badges
asked 8 hours ago
Mattman944Mattman944
1,5201 gold badge3 silver badges11 bronze badges
asked 8 hours ago
Mattman944Mattman944
1,5201 gold badge3 silver badges11 bronze badges
asked 8 hours ago
Mattman944Mattman944
1,5201 gold badge3 silver badges11 bronze badges
asked 8 hours ago
Mattman944Mattman944
1,5201 gold badge3 silver badges11 bronze badges
1,5201 gold badge3 silver badges11 bronze badges
$begingroup$
First spend some time reading up on the whole idea of regenerative receivers; what they do is a bit odd. You probably wouldn't want to do this today when there are 2.4 GHz digital packet radio modules like nRF24 clones comparable to (and in some cases interoperable with) what high end RC sets use available for $1 each.
$endgroup$
– Chris Stratton
8 hours ago
$begingroup$
@ChrisStratton - My brother has a bunch of these from the 90s. I am helping him to get them working again. He says that although they are cheap, they were really fun to race. We believe that caps have degraded. The throttle is frequency modulated and works. The steering is duty cycle controlled and doesn't work.
$endgroup$
– Mattman944
5 hours ago
$begingroup$
Then the problem is likely with the decoder circuit not the regenerative detector
$endgroup$
– Chris Stratton
4 hours ago
add a comment |
$begingroup$
First spend some time reading up on the whole idea of regenerative receivers; what they do is a bit odd. You probably wouldn't want to do this today when there are 2.4 GHz digital packet radio modules like nRF24 clones comparable to (and in some cases interoperable with) what high end RC sets use available for $1 each.
$endgroup$
– Chris Stratton
8 hours ago
$begingroup$
@ChrisStratton - My brother has a bunch of these from the 90s. I am helping him to get them working again. He says that although they are cheap, they were really fun to race. We believe that caps have degraded. The throttle is frequency modulated and works. The steering is duty cycle controlled and doesn't work.
$endgroup$
– Mattman944
5 hours ago
$begingroup$
Then the problem is likely with the decoder circuit not the regenerative detector
$endgroup$
– Chris Stratton
4 hours ago
$begingroup$
First spend some time reading up on the whole idea of regenerative receivers; what they do is a bit odd. You probably wouldn't want to do this today when there are 2.4 GHz digital packet radio modules like nRF24 clones comparable to (and in some cases interoperable with) what high end RC sets use available for $1 each.
$endgroup$
– Chris Stratton
8 hours ago
$begingroup$
First spend some time reading up on the whole idea of regenerative receivers; what they do is a bit odd. You probably wouldn't want to do this today when there are 2.4 GHz digital packet radio modules like nRF24 clones comparable to (and in some cases interoperable with) what high end RC sets use available for $1 each.
$endgroup$
– Chris Stratton
8 hours ago
$begingroup$
@ChrisStratton - My brother has a bunch of these from the 90s. I am helping him to get them working again. He says that although they are cheap, they were really fun to race. We believe that caps have degraded. The throttle is frequency modulated and works. The steering is duty cycle controlled and doesn't work.
$endgroup$
– Mattman944
5 hours ago
$begingroup$
@ChrisStratton - My brother has a bunch of these from the 90s. I am helping him to get them working again. He says that although they are cheap, they were really fun to race. We believe that caps have degraded. The throttle is frequency modulated and works. The steering is duty cycle controlled and doesn't work.
$endgroup$
– Mattman944
5 hours ago
$begingroup$
Then the problem is likely with the decoder circuit not the regenerative detector
$endgroup$
– Chris Stratton
4 hours ago
$begingroup$
Then the problem is likely with the decoder circuit not the regenerative detector
$endgroup$
– Chris Stratton
4 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
A super-regenerative receiver is actually an oscillator that is arranged to periodically be allowed to oscillate then stopped (or Quenched as it is called).
The time taken for the oscillations to build up depend upon the signal (or noise) level in the circuit. When there is a signal present at the oscillation frequency the oscillations will start more quickly.
The time taken to start oscillation will affect the average current so by filtering this the modulation can be recovered.
They hav have extremely high-gain and be sensitive to microvolts of signal but have rather broad bandwidth as well as radiating at the operating frequency.
Because they can get such high gains from a single active device they were popular when gain was expensive or for very low-cost applications where the limitations were acceptable. The main application until recently was for remote control of garage doors and toys. Garage door openers now use more sophisticated receivers. More stringent FCC requirements also restrict their use.
They were in vented in the 1920' by Edwin Armstrog who also invented the Superhet receiver technique (super-sonic-heterodyne).
In the circuit shown Q1 is configured as an oscillator with the frequency set by L1 and C2 with feedback from c3.
Since there is a positive feedback loop the antenna can be connected either at the collector or emitter - most circuits I have seen connect it to the tuned circuit (L1/C2).
Oscillations build-up from noise or the signal and cause a rectified version to appear at the base and emitter of the transistor charging up C4 modifying the bias of the transistor. At some point the bias will be such that the oscillations will stop and C4 will discharge through resistors R2 and R3. Eventually the oscillations will start again and the cycle will repeat typically at a few 10's or 100s of kilohertz (the quench frequency).
The average collector current is sensed with R4 causing a voltage that varies with the signal level although it also has a high level of the quench frequency. This is filtered by the resistors R5 and R6 and C7 and C8 leaving the modulation as an output.
edited 4 hours ago
Bruce Abbott
26.8k1 gold badge21 silver badges36 bronze badges
answered 5 hours ago
Kevin WhiteKevin White
14.3k1 gold badge18 silver badges25 bronze badges
$endgroup$
$begingroup$
Thanks. I have been obsessed with the burst behavior (quench), not knowing that it was expected.
$endgroup$
– Mattman944
5 hours ago
add a comment |
Your Answer
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
A super-regenerative receiver is actually an oscillator that is arranged to periodically be allowed to oscillate then stopped (or Quenched as it is called).
The time taken for the oscillations to build up depend upon the signal (or noise) level in the circuit. When there is a signal present at the oscillation frequency the oscillations will start more quickly.
The time taken to start oscillation will affect the average current so by filtering this the modulation can be recovered.
They hav have extremely high-gain and be sensitive to microvolts of signal but have rather broad bandwidth as well as radiating at the operating frequency.
Because they can get such high gains from a single active device they were popular when gain was expensive or for very low-cost applications where the limitations were acceptable. The main application until recently was for remote control of garage doors and toys. Garage door openers now use more sophisticated receivers. More stringent FCC requirements also restrict their use.
They were in vented in the 1920' by Edwin Armstrog who also invented the Superhet receiver technique (super-sonic-heterodyne).
In the circuit shown Q1 is configured as an oscillator with the frequency set by L1 and C2 with feedback from c3.
Since there is a positive feedback loop the antenna can be connected either at the collector or emitter - most circuits I have seen connect it to the tuned circuit (L1/C2).
Oscillations build-up from noise or the signal and cause a rectified version to appear at the base and emitter of the transistor charging up C4 modifying the bias of the transistor. At some point the bias will be such that the oscillations will stop and C4 will discharge through resistors R2 and R3. Eventually the oscillations will start again and the cycle will repeat typically at a few 10's or 100s of kilohertz (the quench frequency).
The average collector current is sensed with R4 causing a voltage that varies with the signal level although it also has a high level of the quench frequency. This is filtered by the resistors R5 and R6 and C7 and C8 leaving the modulation as an output.
edited 4 hours ago
Bruce Abbott
26.8k1 gold badge21 silver badges36 bronze badges
answered 5 hours ago
Kevin WhiteKevin White
14.3k1 gold badge18 silver badges25 bronze badges
$endgroup$
$begingroup$
Thanks. I have been obsessed with the burst behavior (quench), not knowing that it was expected.
$endgroup$
– Mattman944
5 hours ago
add a comment |
$begingroup$
A super-regenerative receiver is actually an oscillator that is arranged to periodically be allowed to oscillate then stopped (or Quenched as it is called).
The time taken for the oscillations to build up depend upon the signal (or noise) level in the circuit. When there is a signal present at the oscillation frequency the oscillations will start more quickly.
The time taken to start oscillation will affect the average current so by filtering this the modulation can be recovered.
They hav have extremely high-gain and be sensitive to microvolts of signal but have rather broad bandwidth as well as radiating at the operating frequency.
Because they can get such high gains from a single active device they were popular when gain was expensive or for very low-cost applications where the limitations were acceptable. The main application until recently was for remote control of garage doors and toys. Garage door openers now use more sophisticated receivers. More stringent FCC requirements also restrict their use.
They were in vented in the 1920' by Edwin Armstrog who also invented the Superhet receiver technique (super-sonic-heterodyne).
In the circuit shown Q1 is configured as an oscillator with the frequency set by L1 and C2 with feedback from c3.
Since there is a positive feedback loop the antenna can be connected either at the collector or emitter - most circuits I have seen connect it to the tuned circuit (L1/C2).
Oscillations build-up from noise or the signal and cause a rectified version to appear at the base and emitter of the transistor charging up C4 modifying the bias of the transistor. At some point the bias will be such that the oscillations will stop and C4 will discharge through resistors R2 and R3. Eventually the oscillations will start again and the cycle will repeat typically at a few 10's or 100s of kilohertz (the quench frequency).
The average collector current is sensed with R4 causing a voltage that varies with the signal level although it also has a high level of the quench frequency. This is filtered by the resistors R5 and R6 and C7 and C8 leaving the modulation as an output.
edited 4 hours ago
Bruce Abbott
26.8k1 gold badge21 silver badges36 bronze badges
answered 5 hours ago
Kevin WhiteKevin White
14.3k1 gold badge18 silver badges25 bronze badges
$endgroup$
$begingroup$
Thanks. I have been obsessed with the burst behavior (quench), not knowing that it was expected.
$endgroup$
– Mattman944
5 hours ago
add a comment |
$begingroup$
A super-regenerative receiver is actually an oscillator that is arranged to periodically be allowed to oscillate then stopped (or Quenched as it is called).
The time taken for the oscillations to build up depend upon the signal (or noise) level in the circuit. When there is a signal present at the oscillation frequency the oscillations will start more quickly.
The time taken to start oscillation will affect the average current so by filtering this the modulation can be recovered.
They hav have extremely high-gain and be sensitive to microvolts of signal but have rather broad bandwidth as well as radiating at the operating frequency.
Because they can get such high gains from a single active device they were popular when gain was expensive or for very low-cost applications where the limitations were acceptable. The main application until recently was for remote control of garage doors and toys. Garage door openers now use more sophisticated receivers. More stringent FCC requirements also restrict their use.
They were in vented in the 1920' by Edwin Armstrog who also invented the Superhet receiver technique (super-sonic-heterodyne).
In the circuit shown Q1 is configured as an oscillator with the frequency set by L1 and C2 with feedback from c3.
Since there is a positive feedback loop the antenna can be connected either at the collector or emitter - most circuits I have seen connect it to the tuned circuit (L1/C2).
Oscillations build-up from noise or the signal and cause a rectified version to appear at the base and emitter of the transistor charging up C4 modifying the bias of the transistor. At some point the bias will be such that the oscillations will stop and C4 will discharge through resistors R2 and R3. Eventually the oscillations will start again and the cycle will repeat typically at a few 10's or 100s of kilohertz (the quench frequency).
The average collector current is sensed with R4 causing a voltage that varies with the signal level although it also has a high level of the quench frequency. This is filtered by the resistors R5 and R6 and C7 and C8 leaving the modulation as an output.
edited 4 hours ago
Bruce Abbott
26.8k1 gold badge21 silver badges36 bronze badges
answered 5 hours ago
Kevin WhiteKevin White
14.3k1 gold badge18 silver badges25 bronze badges
$endgroup$
A super-regenerative receiver is actually an oscillator that is arranged to periodically be allowed to oscillate then stopped (or Quenched as it is called).
The time taken for the oscillations to build up depend upon the signal (or noise) level in the circuit. When there is a signal present at the oscillation frequency the oscillations will start more quickly.
The time taken to start oscillation will affect the average current so by filtering this the modulation can be recovered.
They hav have extremely high-gain and be sensitive to microvolts of signal but have rather broad bandwidth as well as radiating at the operating frequency.
Because they can get such high gains from a single active device they were popular when gain was expensive or for very low-cost applications where the limitations were acceptable. The main application until recently was for remote control of garage doors and toys. Garage door openers now use more sophisticated receivers. More stringent FCC requirements also restrict their use.
They were in vented in the 1920' by Edwin Armstrog who also invented the Superhet receiver technique (super-sonic-heterodyne).
In the circuit shown Q1 is configured as an oscillator with the frequency set by L1 and C2 with feedback from c3.
Since there is a positive feedback loop the antenna can be connected either at the collector or emitter - most circuits I have seen connect it to the tuned circuit (L1/C2).
Oscillations build-up from noise or the signal and cause a rectified version to appear at the base and emitter of the transistor charging up C4 modifying the bias of the transistor. At some point the bias will be such that the oscillations will stop and C4 will discharge through resistors R2 and R3. Eventually the oscillations will start again and the cycle will repeat typically at a few 10's or 100s of kilohertz (the quench frequency).
The average collector current is sensed with R4 causing a voltage that varies with the signal level although it also has a high level of the quench frequency. This is filtered by the resistors R5 and R6 and C7 and C8 leaving the modulation as an output.
edited 4 hours ago
Bruce Abbott
26.8k1 gold badge21 silver badges36 bronze badges
answered 5 hours ago
Kevin WhiteKevin White
14.3k1 gold badge18 silver badges25 bronze badges
edited 4 hours ago
Bruce Abbott
26.8k1 gold badge21 silver badges36 bronze badges
edited 4 hours ago
Bruce Abbott
26.8k1 gold badge21 silver badges36 bronze badges
edited 4 hours ago
Bruce Abbott
26.8k1 gold badge21 silver badges36 bronze badges
26.8k1 gold badge21 silver badges36 bronze badges
answered 5 hours ago
Kevin WhiteKevin White
14.3k1 gold badge18 silver badges25 bronze badges
answered 5 hours ago
Kevin WhiteKevin White
14.3k1 gold badge18 silver badges25 bronze badges
answered 5 hours ago
Kevin WhiteKevin White
14.3k1 gold badge18 silver badges25 bronze badges
14.3k1 gold badge18 silver badges25 bronze badges
$begingroup$
Thanks. I have been obsessed with the burst behavior (quench), not knowing that it was expected.
$endgroup$
– Mattman944
5 hours ago
add a comment |
$begingroup$
Thanks. I have been obsessed with the burst behavior (quench), not knowing that it was expected.
$endgroup$
– Mattman944
5 hours ago
$begingroup$
Thanks. I have been obsessed with the burst behavior (quench), not knowing that it was expected.
$endgroup$
– Mattman944
5 hours ago
$begingroup$
Thanks. I have been obsessed with the burst behavior (quench), not knowing that it was expected.
$endgroup$
– Mattman944
5 hours ago
add a comment |
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$begingroup$
First spend some time reading up on the whole idea of regenerative receivers; what they do is a bit odd. You probably wouldn't want to do this today when there are 2.4 GHz digital packet radio modules like nRF24 clones comparable to (and in some cases interoperable with) what high end RC sets use available for $1 each.
$endgroup$
– Chris Stratton
8 hours ago
$begingroup$
@ChrisStratton - My brother has a bunch of these from the 90s. I am helping him to get them working again. He says that although they are cheap, they were really fun to race. We believe that caps have degraded. The throttle is frequency modulated and works. The steering is duty cycle controlled and doesn't work.
$endgroup$
– Mattman944
5 hours ago
$begingroup$
Then the problem is likely with the decoder circuit not the regenerative detector
$endgroup$
– Chris Stratton
4 hours ago