287m wrote:Frank & Eddie, cool to share tda based poweramp schemo or pointed a some link?

I know, i can borrow Mooer baby bomb. But, have a diy its fun.
Thanks

https://www.ebay.com/itm/TPA3118-BTL-Mo ... 2568167198

IT'S TWO DOLLARS!

There are some (at least partial) gut shots on these pages: https://www.digimart.net/magazine/article/2016120902318.html https://www.ikebe-gakki.com/ec/pro/disp/1/515702 http://benimarulabo.com/xotic-soul-driven-ah-allen-hinds/ SMD transistors say "2CW" which is BC849C (or CW). I can't mak...

swt wrote:hi. can you tell me the tonal differences between 4558, 4559 and 4560?. thanks a lot

Undetectable, if they exist at all.

If I understand the way most pedals are wired, using an external power supply (not a battery) means the pedal is powered up all the time, even without a guitar cord plugged into the input. The only thing the switch does is route signal thru the pedal circuit or not (and turn on the LED). Battery is ...

Schem and layout are on this page:

http://madamp.de/index/lang/en/artikel/17

lead2203 wrote:I have heard it's made and designed by a Chinese company.

Wonder where you heard that. According to the Friedman web site, it's built in the USA.
http://friedmanamplification.com/friedm ... e-od-pedal

In the right tab below the text box it says "Upload attachment" - use that.

Has anyone nailed down the differences between the SYOD 1 and 2? (or the switched components in the 3?)

Thanks,
Michael

Can anyone explain why the pedal started working when I turned the guitar down?

OK, I figured it out. The trigger was I accidentally discovered that if I turned the guitar volume pot down just a little, it started working. Then I noticed scratchiness when I turned the guitar volume, which sounded like DC on the pot. Voila! Yes, there was DC on the pot. Turned out that C1 on the...

Sorry, that was a typo - should've been 12.1V. I'd correct the original post but that would make your reply seem bizarre. I'm certain that my meter is fine, though probably not to the standard of your desk meter. As to the zener for polarity question - that is part of what I was asking. More than th...

I sent you a PM.

I'm questioning the value of using a zener as the polarity insurance diode in a pedal, as is done with any design I've seen that has the zener as the way to "regulate" the voltage to X volts (esp. with charge pumps). I see this with the cathode on the power input and the anode to ground. T...

Still available?

I did this analogguru mod to my unused SD-1: (https://www.freestompboxes.org/viewtopic.php?f=11&t=3341#p24066) 1.) Remove R5 - R9, C2 - C6, D4 - D6, IC 1 2.) place a jumper wire instead of D5 3.) assemble a socket for IC1 4.) assemble R5 = 10k, R6 = 1k, R7 = 1k, R8 = 220 Ohm, R9 = 1k 5.) assembl...