Obionar
RommudohToday's #soldering project done: a #mixer with three inputs using a #TL072 #opamp. I have a layout planned for a slightly bigger #perfboard with four to six inputs.
#diysynth
#diysynth
I found the culprit... It's the #TL072 that goes into phase reversal because the gate and trigger signals are -12V when low.
After swapping it with a #LM358, the output signals for trigger and gate, including the LEDs work as intended.
This took a lot of time to find out, but I've gained some knowledge now.
#PhaseReversal #OpAmps #BugFixing
After swapping it with a #LM358, the output signals for trigger and gate, including the LEDs work as intended.
This took a lot of time to find out, but I've gained some knowledge now.
#PhaseReversal #OpAmps #BugFixing
Ian NeillFinally got my Kwelatones TL072 Audio Amp boxed and ready for some tunes! 🥳
It works!
Audio test was successful, quiet audio in -> loud audio out. Whoop, whoop!
Left/right balance testing confirmed that I had not got that reversed. Only mistake seems to be with the volume pot, as I have to turn it anti-clockwise to increase the volume. I think I will have to fix that 🤔
Other observations are a bit of hiss, and some mains hum from the laptop.
Next, a box to live in and then I can connect it to my RC2040 🥳
The kit soldering and build is complete... Next I need to test it with some audio and then house it in the small tin, or maybe something a little bigger 🤔
Initial testing so far has just been connecting the 2x 9v batteries and switching it on. The power led illuminated, as hoped for!
I have now soldered all the PCB components. Off board potentiometers, audio sockets and power connectors next.
