SOLVED Magnetron LFO not working

R

rozencratz

Member
The LFO LED on my Magnetron Delay isn't turning on and I'm at a complete loss for what to try next to make it work after weeks of trial and error. As far as I can tell, everything else on the board is working. All potentiometers seem to work as intended I think. The LED1 turns on when expected.
Things I've checked/did to try and find the root cause:
- Checked all component values are correct
- Checked voltages are expected where expected
- Checked continuity with every pad, including to the LFO section and can confirm the A/K pads for LED have continuity as expected
- Changed LED colors and continuously confirm that the LED turns on
- Changed ICs
- Took the LED off board, connected K direct to ground and A to a 4.7k resistor and then tried to get a light by connected the CLR to the various parts of the circuit that are connected to the "LFO" section- still nothing. Using this method and connecting the CLR to V+ does turn on the LED

Would love any ideas for what to try next to make it work.
 

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For what it’s worth, I’m only seeing 1.68V at the LFO point on the schematic. Perhaps that’s why the LED doesn’t light up? If so why is the voltage low there? And shouldn’t it fluctuate as well?
 
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I have built one of these and it worked great other than it seemed to thicken my tone.In any event I hope some others can help you with this issue. I will also take a look and see what I can see,
Edit: I double checked all of your resistors and they are correct
 
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Should be a button menu popdown thinger in your OP somewhere.

Go to your OP, click on EDIT and up in the left corner of the post by the Thread Title is a drop down menu labelled (Prefix)... therein you'll find the SOLVED!


PS: Maybe fix the title while you're at it. Helps other people solve their build-problem if they can find your trouble-shooting thread under "Magnetron" instead of "Magentron"
 
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Feral Feline said:
Should be a button menu popdown thinger in your OP somewhere.

Go to your OP, click on EDIT and up in the left corner of the post by the Thread Title is a drop down menu labelled (Prefix)... therein you'll find the SOLVED!


PS: Maybe fix the title while you're at it. Helps other people solve their build-problem if they can find your trouble-shooting thread under "Magnetron" instead of "Magentron"
Click to expand...
Thanks
 
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