| Reklats |
I've built a few different unbuffered gainclones so I could play with different designs, but I have a gaping hole in my gainclone knowledge:
With a pot gainclone like the one depicted on the national datasheet, when the volume is zero, wouldn't the signal be shorted to itself? I know the signal ground is attached to the power ground, but is it bad for the source to have its outputs shorted?
Right now I have a small resistor between the pot and ground to prevent disasters, so my volume only goes down most of the way. |
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| Upupa Epops |
| Have you connected source on collector of pot ? ! |
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| mcs |
If you connect the pot in the normal way, the input of your poweramp will be shorted, not the output of the source. The source will see the value of the pot as a load.
Best regards,
Mikkel C. Simonsen |
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| jackinnj |
| given the power supply voltage etc. you adjust the potentiometer for an "optimal" distortion -- if you have a scope use a 1V 1kHz source and adjust the pot until the waveform starts to clip --- then back off. To be a lot more precise, if you have a distortion analyzer you adjust the pot (and this assumes that you are using a high quality source) for distortion of about 0.01% at 1kHz. |
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| Reklats |
While searching to see which pin the collector is I figured out how I was supposed to have it wired, so problem solved.
Thanks. |
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