Spring reverb circuit oscillation

[smilan]

Hi, I made a spring reverb circuit using this schematic:

I'm driving the reverb tank using this circuit:

Everything sounds pretty good except when I'm hitting the reverb circuit too hard the recovery circuit starts to oscillate a high frequency that doesn't fade away until I'm disconnecting the power from the reverb circuit.
Any suggestions on how I can eliminate this problem?
Here's how it sounds:
https://youtu.be/O4Q4RRoKRwk

 

[JohnRoberts]

Have you tried adding a cap across the reverb coil..?

5532 is unity gain stable so should tolerate a feedback cap.

JR

 

[Audio1Man]

I see a few things. No PS bypass. Why did you use U1B as the recovery amp while U1A is the drive amp?  The drive amp should be U1A & U1B. Layout cross coupling? You may need to add a small resistor to pin 5 of U1B to de que the circuit (stop ringing).
Duke

 

[gyraf]

+1 on calming down the psu first..

 

[Bo Deadly]

I see a few things. No PS bypass. Why did you use U1B as the recovery amp while U1A is the drive amp?  The drive amp should be U1A & U1B. Layout cross coupling? You may need to add a small resistor to pin 5 of U1B to de que the circuit (stop ringing).
Duke

The schem does say U1A & U1B for the drive amp. But if that's not the reality, yes, it should definitely be the same amp. And I agree a 1K in series with the input could fix it.

 

[zamproject]

hello

I see a few things. No PS bypass. Why did you use U1B as the recovery amp while U1A is the drive amp?  The drive amp should be U1A & U1B. Layout cross coupling? You may need to add a small resistor to pin 5 of U1B to de que the circuit (stop ringing).
Duke

We can maybe suppose this is different schemo with IC for both amp labelled U1 ?

Now...what about the the wiring of the unused side of the recovery amp dual opamp ?
With all pin floating at unused opamp side you may have strange behaviour...which can interfere with used opamp side.

Best
Zam

 

[smilan]

Thank you all for your advice, I've grounded the unused side of the 5532 at the recovery amp, added 4*100nF bypass caps (which didn't solved the oscillation) and added a 1K resistor in series with the input of the recovery amp and now it sounds much better with no oscillation.
*U1B at the recovery amp is a different IC than  U1B at the drive amp.

 

[Bo Deadly]

Note that if you're doing something on a breadboard, you can easily get weird results because of bad grounding, long wires and crappy jumper contacts. If you did the same thing on a proper PCB, the 1K might not be necessary.

 

[Whoops]

I see a few things. No PS bypass. Why did you use U1B as the recovery amp while U1A is the drive amp?  The drive amp should be U1A & U1B. Layout cross coupling? You may need to add a small resistor to pin 5 of U1B to de que the circuit (stop ringing).
Duke

maybe this helps...
This circuit is from Rod Elliot (ESP), he gives a nice explanation of the circuit over his website:

https://sound-au.com/articles/reverb.htm