A very long time ago a thread about and audio circuit. It wasn't a very good thread in terms of my ability to provide good information but that's besides the point. Quite a while later I finished a schematic and got the board produced.
Here's a snippet of the schematic. The whole thing's pretty big and I don't think it's necessary to show it all anyway because I think the issue occurs here:
The main circuit isn't mine. It's actually BobTPH's from post #89 of the thread I mentioned, with a few adjustments.
If I simulate my circuit in LTspice and watch the output, it's not the same as shown in BobTPH's post, but it is the correct output and the one I want:
If I measure R6 (the output) on my circuit board, this what I get:
Its not the best photo since I was holding the phone one handed but either way, that's not the correct output. I'm supplying the board 5V and a 2kHz signal. I would expect it to look similar to as shown above, but it doesn't.
When I was buying the LT1366's I accidentally bought through hole versions, so I though I would also do a breadboard test as well. I set up the schematic shown above on a breadboard and measured the output:
This time there's was absolutely nothing on the output.
I've double checked my placements and made sure I don't have a bad connection (by giving everything a little wiggle)
Of course most circuits can work in theory, but not in practise. The original circuit was suggested by someone with far greater knowledge than me which means I don't think that the actual circuit design is the issue.
Can anyone help me fix this? It would be very much appreciated!
Bod
Here's a snippet of the schematic. The whole thing's pretty big and I don't think it's necessary to show it all anyway because I think the issue occurs here:
The main circuit isn't mine. It's actually BobTPH's from post #89 of the thread I mentioned, with a few adjustments.
If I simulate my circuit in LTspice and watch the output, it's not the same as shown in BobTPH's post, but it is the correct output and the one I want:
If I measure R6 (the output) on my circuit board, this what I get:
Its not the best photo since I was holding the phone one handed but either way, that's not the correct output. I'm supplying the board 5V and a 2kHz signal. I would expect it to look similar to as shown above, but it doesn't.
When I was buying the LT1366's I accidentally bought through hole versions, so I though I would also do a breadboard test as well. I set up the schematic shown above on a breadboard and measured the output:
This time there's was absolutely nothing on the output.
I've double checked my placements and made sure I don't have a bad connection (by giving everything a little wiggle)
Of course most circuits can work in theory, but not in practise. The original circuit was suggested by someone with far greater knowledge than me which means I don't think that the actual circuit design is the issue.
Can anyone help me fix this? It would be very much appreciated!
Bod