I apologize if this is in the wrong forum... I'm unable to post in the Power forum.
I'm wondering if the diodes in the voltage doubler circuit shown here act as reverse polarity protection as well.
(Actual 'doubled' voltage is closer to 16V)
Thank you...

I'm reposting this regarding Madbean's Harbinger 1.5 / Univibe: I've been playing around with the various pots and trimpots and to my *imperfect* ears, in the vibrato mode, the amount the pitch is modulated is, let's say, a semitone. So, the signal warbles up and down a semitone and it seems that th...

I have a circuit which, with 9V, draws around 31mA. I've been using this voltage 'doubler' (image attached) with a NE555P chip to bring the voltage to 15.9V and the current to 75.5mA. It sounds fine, no issues I can detect, but I don't have much experience using doublers so I'm curious if this looks...

Just my observations; Others here may know more but I would try,, Move wiper of Balance pot to Vref, Not ground. Then you can delete C11,12,14&15 as everything is then all Referenced to Vref. (no need to swap com points at that point in signal path) Also no real need for R19&R24 as you alre...

In V2, what if you reference 4PDT lug 4 (via the 47k) and lug 6 to Vref instead of ground? Same with the Gain pot, reference lug(s) 1 of Gain A and Gain B pot to Vref instead of ground. Might reduce the C3 charge/discharge that could be causing a pop. Or if you go with dual rail supply (+9V and -9V...

I've never had a failure with a Taiway toggle switch. And I've not yet had a 4PDT foot switch that worked well, all the ones I've used I've had to take apart, clean and re-lube to get them to work consistently, even when new. For 3PDT foot switches, DeMont, Gorva and Alpha have good longevity (numb...

I'm looking for recommendations for quality SPDT toggle switches. I have a few Taiway on hand... opinions?
Also wondering about opinions on good quality 4PDT stomp switches, preferably with a soft click but not totally necessary.
Thanks

One more thought: instead of doubling +9V to ~+18V and then dividing it, what about inverting +9V to -9V and using ground for your op amp reference? All the same to the op amps (18V between V+ and V- either way), same headroom, and it simplifies your power section. I'm not sure of the best way to d...

Actually, when I configure it as I described above, the popping is very loud when I first connect it to power then fades out to a very subtle pop after 8 or 10 seconds. So, after that initial 8 or 10 second period, the pedal is usable but still annoying.

Random thoughts: Are you testing it with (1) other pedals in the send/return loops, or (2) nothing connected to send/return jacks, or (3) send A patched to return A, and send B patched to return B? Have you tried adding pulldown resistors to the send/return signal leads? Have you considered ventril...

I was having issues with a parallel looper design and asked for advice a while back to help eliminate switch popping and circuit noise. The attached file [SCHEMATIC_Version1] shows a pop-free version; the switch popping finally disappeared after removing all pulldown resistors. The guitar signal was...

I'm looking for for a solution to popping that's occurring with a 4PDT and SPDT in a circuit by potentially utilizing a microcontroller. I've read that they can be programmed to briefly mute the signal as they switch, which can eliminate popping. It's something I'd eventually love to learn how to pr...

I'm looking for a supply of S-taper, 10k pots with a minimum life cycle of 100,000 rotations.
Has anyone encountered these?

Here is a schematic of the Tails / Bypass designed by Slacker that I attempted to incorporate. I changed R5 from 1k to 47k since in an earlier version of my circuit, it wouldn't work properly with 1k.

If this the All-Star Digital Delay that you are referring try he's method - make the switching before the capacitor, you may avoid the popping. Maybe is not best technical solution, but if solves your problem go for it. Or at least try it. [/quote] I tried moving the wire from between R16 & R17...

karul wrote: ↑03 May 2022, 22:42 Take a look at Chapter 6 and 9. Highly recommended book. viewtopic.php?p=287940&hilit=Small+Sign ... gn#p287940

That looks like a great book... thanks again.

I forgot to mention that I'm also currently running it at 18v. There was too much clipping at 9v. OK. I saw 9V supply at the schematic and 8x gain - that's calling for trouble. If this the All-Star Digital Delay that you are referring try he's method - make the switching before the capacitor, you m...

karul wrote: ↑03 May 2022, 19:16 Do you really need that gain on return paths? Don't you have problems with clipping?

I forgot to mention that I'm also currently running it at 18v. There was too much clipping at 9v.

Do you really need that gain on return paths? Don't you have problems with clipping? I initially had different resistors in there and had clipping, so after fiddling with them I found the 330k/47k to work with no clipping. I still might adjust the ratio a little lower and lower their overall values...

karul wrote: ↑03 May 2022, 13:44 Also check those 100p at the feedback loops whether they are 100p or 10p. They are low pass filters. Lower the value, higher the cut-off freq. So instead 4.8kHz you end up with 48kHz.

Thanks for the tip. Yeah, they're 100p.