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VFE Projects / Re: Bumble bee ain’t swellin. Help me Mr. Bean :D
« on: May 27, 2020, 12:20:09 PM »
JimiLee - that 2µ2 cap is actually C14. I was referring to C4 (0.68µF) - it's always connected. C5 & C4 are actuated via the toggle switch. And never mind the bit about pulling the FET or any transistors. The following should help.
Have you gone thru this part of the setup procedure (#4 from page 7)? - - - - "4) To set up the swell effect do the following: set the switch in its middle position, the MIX knob all the way counter-clockwise and all other pots to their middle position. Leave TWEAK in the center and the 20k trimmer all the way down. Now, adjust the 20k trimmer clockwise until you hear notes start to swell up in volume. Continue adjusting it until the volume of the swell matches your input. From there, you can adjust the TWEAK trimmer to re-tune. In my build, the 20k is set at about 11 o’clock and the TWEAK trimmer pretty much in the middle."
What occurs to me is that the voltages are to be measured with the above mentioned settings. Mind you please, that this is an assumption on my part as it is not clear at what settings things should be when measuring the voltages.
So, if you're getting proper voltages on the collectors of Q6 & Q7 with the 20K trimmer turned all the way down (counter-clockwise), then you should be able to get it swell by following the instructions in #4 on page 7 as noted above.
Have you gone thru this part of the setup procedure (#4 from page 7)? - - - - "4) To set up the swell effect do the following: set the switch in its middle position, the MIX knob all the way counter-clockwise and all other pots to their middle position. Leave TWEAK in the center and the 20k trimmer all the way down. Now, adjust the 20k trimmer clockwise until you hear notes start to swell up in volume. Continue adjusting it until the volume of the swell matches your input. From there, you can adjust the TWEAK trimmer to re-tune. In my build, the 20k is set at about 11 o’clock and the TWEAK trimmer pretty much in the middle."
What occurs to me is that the voltages are to be measured with the above mentioned settings. Mind you please, that this is an assumption on my part as it is not clear at what settings things should be when measuring the voltages.
So, if you're getting proper voltages on the collectors of Q6 & Q7 with the 20K trimmer turned all the way down (counter-clockwise), then you should be able to get it swell by following the instructions in #4 on page 7 as noted above.