Back up to speed again this morning. 

You notice this thread was dead for 19+ years???

They are not the same but for "effects" use one is much like the other. Especially since the internal details have evolved over the decades and you can't know which guts you will get.

'307 is a compensated '101 so is a '741-alike.

'308 is actually a different plan and, with suggested 30pFd compensation, an octave slower, which might mellow a RAT.

'10-, '20-, and '30- are commercial industrial military sortings; if you fly through enemy fire war-zones you prefer the '10- part. These used to be different prices; all moot now.


https://www.analog.com/media/en/technical-documentation/data-sheets/lm101a.pdf


https://www.analog.com/media/en/technical-documentation/data-sheets/lt0108.pdf

I used LM307s on my expandora and they sound as good if not better than 07s.
Aharon

Quote from: aron on April 21, 2024, 03:05:56 PMJust files have been moved over (I think).

Even a healthy forum server will be slow when doing a major file transfer. It's like everybody requesting everything all at the same time. I once brought a mighty PDP-10 to a crawl for three days running to get a forum over onto a Pentium. (Turned out the PDP-10 was the superior machine for the job, but parts were scarce.)

Looking OK now, 6:40pm Maine time.

Ok just to finish up. Thank you again Antonis, gotta start there. 100R for the base worked ok, but I went with 1ks though probably could've gone higher like 10k; figuring I get 5mA tops base current, noticed Druid does 10k on the 3904 so 500uA to a min 50nA. The 2222 is min 20nA so base current could reduce.

One bothersome thing, the Cf on the LPF (1st section) accounts for the npn voltage drop, the inverter Rf did not. Rather than riddle I changed the 10k:10k voltage divider from 5v to 5k6:10k to give inverter bias about 3.2v rather than 2.5v, therefore offsetting it higher by about the drop, so they seem even-ish.

Tacked on to the FilterFX it makes fun by changing the rate while the depth goes inverse, so less on faster, or cycling through different waveforms, etc...haven't tried much as I get stuck in seeing how to play with the current weird.

I'm going to get sound samples up, but want er boxed first - as you know, she looks like ultraviolet catastrophe! So for my vein of abuse I need to get to making the extras on one board and manage/route wires sensibly. Little by little

It's still on the old server. Just files have been moved over (I think).

Speeding up now at my end. Perhaps the database was still updating?

A little better today so the new on must be a Prius server; slowest rate of acceleration but it'll get up to speed (if you don't make it break!)

Still the same on my Dial-Up Phone Line connection as it was before.

Thanks for looking duck! The distortion is gone now, I forgot to say that before. The cut on Row J stopped the link on I11 and J11 from connecting the Pot wiper with the ground of the audio jacks - adding this cut made the circuit work with main electricity (but it no longer works with a battery - which is fine; I don't want to power it with a battery)