Osscar - Wonderful! A beautiful construction!
Looking forward to hearing news of it's operation. Post more photos if you have them
Whammy is finally finished!
I turned to the dark side (with a blue LED of course):
internal part( There was a small hum on the left channel from the transformer - I made a mu-metal shield)
sounds very good, the bottom end is very fast!
Bias 100mA, Irfs, BB OPA 2604 (original), all 22uf non-polar+film caps.Rails: +-17V. heat sinks - 55 Celsius. offset - 1mV and 0,1mV
In the planning stages for this build and I really want to use an AD8620 I have laying around. Specs show max dual-supply voltage at 13V. It looks like its R35 and R36 need to be changed to drop the voltage a bit but not sure what values to try. Can anyone help? Thanks!
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I've been looking for a really nice sound ding low power amp to drive my horn's, could I use something like this or would this struggle to drive 8 ohms?
Thanks
I'm currently using 2.2R source resistors to drive 8R speakers and it works fine. Loading the schematic into Spice suggests 4R speakers will be poor unless you double up on the Fets.
TM
I tried it .....
Attachments
C20 and the Pot
6L6,
'Faster than a speeding bullet....' Thanks for a quick response on C20.
What can you tell me about the Pot value please. The schematic says 20-100K which is the first time I have ever seen a value range. Can you offer any guidance please ?
Thanks
Mark
6L6,
'Faster than a speeding bullet....' Thanks for a quick response on C20.
What can you tell me about the Pot value please. The schematic says 20-100K which is the first time I have ever seen a value range. Can you offer any guidance please ?
Thanks
Mark
Good potentiometers are getting progressively more difficult to source as all things march further and further towards becoming digital. And some people want to use stepped attenuators instead of pots. So our choice is somewhat limited.
The long story made short is that the value is not super critical, however if much lower than 20K the input impedance can get hard for some sources to drive, and if higher than 100K there can be interesting interactions with input capacitance. In either case, falling outside the range might make it difficult for your sources to drive.
The long story made short is that the value is not super critical, however if much lower than 20K the input impedance can get hard for some sources to drive, and if higher than 100K there can be interesting interactions with input capacitance. In either case, falling outside the range might make it difficult for your sources to drive.
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