JamieK
Newbie level 2
ultrasonic op amp
Hi! I desperately need help concerning the circuits I've attached below. Basically, it is an ultrasonic receiver circuit, with two ultrasonic receivers connected. The first circuit shown is just for one ultrasonic receiver.
**broken link removed**
The op-amp labelled A is used to amplify the signal while the second op-amp labelled B acts as a comparator. It's a simple concept but for some reason, the circuit does not work. I've tried to test op-amp A by itself and have disconnected all connections to op-amp B. However, the output from opamp A is not amplified at all. So far, I've been using a signal generator to supply a 40kHz signal in place of my ultrasonic receiver. There is definitely nothing wrong with my circuit connections or the breadboard as I've reconnected everything, had a lecturer check the connections and changed breadboard several times already.
I've tested three different types of op-amps, including OPA2340 (as suggested in the circuit), LM833N and UA741 and none of them work. I've even bought new op-amps but I still don't get an amplified signal. What I do get is either the exact same waveform, or a waveform with smaller amplitude. Also, whether or not there are signal inputs in place of the ultrasonic receivers, the DC output of Op-amp A is the same as the voltage supplied at Vcc for the opamp chip.
This is the full circuit:
**broken link removed**
Theoretically, the circuit is sound (to me at least). Is there something opamps require that I'm not aware of? I would be grateful for any suggestions or help at this point as I've been troubleshooting this circuit for two weeks. Also, if instead, any of you have a suggestion of replacement components or circuits that works the same way, I would also be grateful to have them!
Please help! I need a solution ASAP!
Thank you!
Hi! I desperately need help concerning the circuits I've attached below. Basically, it is an ultrasonic receiver circuit, with two ultrasonic receivers connected. The first circuit shown is just for one ultrasonic receiver.
**broken link removed**
The op-amp labelled A is used to amplify the signal while the second op-amp labelled B acts as a comparator. It's a simple concept but for some reason, the circuit does not work. I've tried to test op-amp A by itself and have disconnected all connections to op-amp B. However, the output from opamp A is not amplified at all. So far, I've been using a signal generator to supply a 40kHz signal in place of my ultrasonic receiver. There is definitely nothing wrong with my circuit connections or the breadboard as I've reconnected everything, had a lecturer check the connections and changed breadboard several times already.
I've tested three different types of op-amps, including OPA2340 (as suggested in the circuit), LM833N and UA741 and none of them work. I've even bought new op-amps but I still don't get an amplified signal. What I do get is either the exact same waveform, or a waveform with smaller amplitude. Also, whether or not there are signal inputs in place of the ultrasonic receivers, the DC output of Op-amp A is the same as the voltage supplied at Vcc for the opamp chip.
This is the full circuit:
**broken link removed**
Theoretically, the circuit is sound (to me at least). Is there something opamps require that I'm not aware of? I would be grateful for any suggestions or help at this point as I've been troubleshooting this circuit for two weeks. Also, if instead, any of you have a suggestion of replacement components or circuits that works the same way, I would also be grateful to have them!
Please help! I need a solution ASAP!
Thank you!