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I don't think it's black and white really? I reject the idea it was barebones effort. I came across this circuit because I've been reading Douglas Self's Small Signal Audio. While the circuit is briefly discussed, the critical components that select the frequency range were not explained. I have...

Hey folks, thought I would give GPT-5 a go at some (?simple) circuit analysis. I'm not a circuit wizz myself so not sure how well it did but here is the analysis. You said: how is the frequency range determined in this circuit You said: yes please You said: I would like to create two...

I know it probably won't help those of you in the US, but being in New Zealand, I shouldn't theoretically be affected by tariffs. However, Mouser orders to NZ are fulfilled by the US warehouse. Fearing I'd be effected by tariffs indirectly I decided to give LCSC a try. Will let people know how...

Interesting, do you know what it's based on?

Is that a discrete VCA?

We're talking about two different circuits, a bit confusing I know. The old Russian one was mixing sk30s and 2N7000, where this modern one is using LND150 instead.

@thomasbe86 do you have any insights into the MOSFET aspects of these circuits? Some people in the forum were also talking about how they found the BS170 less harsh sounding than a 2N7000 in this circuit.

The crazy thing to me is that enough people are buying these that it's worth manufacturing them in the first place? Is the casing from a well known package type?

What is your experience with the "preferred" parts?

Did you ever do more testing on these? Do you think they are actually germanium?

It's a voltage inverter whilst also being low dropout voltage. This one can only go to +/-5v though. I think one benefit of LDOs beyond the low voltage dropout is they are pretty quiet...

I actually use a stamp collection binder to house my tested transistors.

You're right definitely looks like DC offset. What I can't figure out is why? The signal generator has no settings for dc offset, why would you set up a sine wave this way by default? For comparison a sine wave sent out of my interface via a tone generator plugin.

I have seen LDO inverters, looking closer they are more in the 5v range though. Do you think the regulated outputs are worth it?

Is the $5 price point for the unregulated version of the DC-DC converters? Is the regulated version worth the $10ish price increase? How does this compare to an LDO inverter?

Hey folks, I've been doing some testing with diodes using my breadboard, except I've run into an issue, no matter how I hook up the diodes, I'm always getting asymmetric clipping. It doesn't matter whether they are silicon, germanium etc. This is as measured with my oscilloscope using a 2.4v...

The other thing with Electrolytics is that their capacitance performance can vary depending on where you are in their voltage rating range I think? I swear I read that somewhere, but now I don't remember where.

Thanks everyone, I'll keep these in mind while designing.

You're unlikely to run into headroom issues with a guitar signal input and the output required going into a poweramp. Look at what the Revv G3 and the Firedman BEOD achieve on 9v. Something to think about with a clean channel is you still want some compression. Spikey transients aren't nice...

As a replacement for the amps in built preamp?