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Building your own stompbox / Re: Hello! My Zendrive has no drive!
« Last post by chromesphere on Today at 07:27:50 AM »
Yeah this one turned into a tough one Hugo.  Did you end up testing the effect externally from the offboard wiring?
Building your own stompbox / Re: My brain got stuck at Power Supply question
« Last post by EBK on Today at 06:52:35 AM »
You can buy transformers with multiple secondaries to build this.

 Or, you can search for a commercially available power supply with multiple "isolated" outputs.  If you look at the commercially available ones, note the prices.  You should see the prices clustered in two groups.  Buy from the higher priced group.  Voodoo Labs makes good ones.  There are several other brands that are good as well.

Cheaper power supplies may use the word "isolated" but may have outputs that share a common ground connection.  Those will be the cheap ones.  Don't buy one of those.  With a truly isolated supply, you can stack two 9V outputs to create an 18V output.  With a cheap one that only claims to have isolated outputs, you'd end up shorting one of them if you attempted this.
If you want them galvanically separated then you need a separate wall wart/ transformer for each 9v /18v supply.  Why do you need that?
Well I teared it down and rebuilt it several times and arrived at something slightly different:
Medved's Fet Twin which has exactly the amount of clean-ness I expected (18 volts provided):

I guess my stress-addled brain just sent wrong information to my hands while sticking parts to the breadboard.


I didn't want to let this go and made a layout for the Tweed Stack - checked it about 20 times - and sent it off AllPCB. Sometimes attack is the best form of defense. Boards will arrive in 3, 4 days' time so time will tell ...
- I'm not comfortable with 240 volts
- I'd like to have several 9V DC outputs that are galvanically separated (plus one or two 18V outputs but here's just for 9V)

My chain of thought was:

1. 24V AC Wallwart
2. "Step down transformators" 24V -> 9V AC for every rail
3. Rectifying
4. extensive filtering
5. LM7809 (plus filtering)
6. Stompbox

I googled away - my problem, though, is missing vocabulary (no formal traning at all).

Does this make sense?
Building your own stompbox / Re: lm386 and an6884 vu meter question
« Last post by sixthfloor on Today at 03:40:49 AM »
VU meters serve to visualize the value of some voltage.

In your case it depends on which voltage you want to monitor; connect the VU meter to the output of the LM386 if you want to monitor the output level, or to the input if you want to monitor the input. Typical applications of both cases would be respectively input level monitoring for saturation detection, and showing the intensity of the output.
Building your own stompbox / Re: Modded Tone Bender II
« Last post by voskarp on Today at 02:50:35 AM »
Thanks for the answer!

Excuse my ignorance, I'm not very experienced with audio electronics, but how will this effect the sound other than the possible gating that you describe, and obviously increased treble that I was after. I'm asking because I wouldn't want the sound to change too much from that I get by bypassing the first transistor (except having possibility to increase hi frequencies).

As I understand it, cutting of the cap C1 wont have much effect on the sound, or? I got the idea for this modification because the TB-1,5/FF doesn't have that cap.
Building your own stompbox / Re: Hello! My Zendrive has no drive!
« Last post by SirHugo on Yesterday at 07:13:02 PM »
I have another pedal with an issue but thatís for another thred, and may be fixed with a replacement component.
Pictures / Re: Pictures!
« Last post by vigilante397 on Yesterday at 07:04:30 PM »
I thought it was an etch too..  8)

Pretty sure you could pull off an etch that tight Rob, but I sure as hell can't ::) I need my robots to do it for me :P
Building your own stompbox / lm386 and an6884 vu meter question
« Last post by pinkjimiphoton on Yesterday at 06:45:43 PM »
dicking around with one of these things i found somewhere in a kit a couple years back, but can't figure out where to connect the vu meter board to? there were no instructions with the dang kit of course. does it connect to the output of the 386? or does it parallel the input?
i've googled data sheets etc but none can seem to tell me where to hook it up to with a bog-standard 386 circuit.

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