Pro Audio Design Forum

Note: the "swinging opamp" if it's what I think it is (common emitter transistors driven by opamp power leads) is a relatively simple way to get there. Yep - that's what it is. Pretty simple circuit with widely available parts. Wished I had an old RE/P or dB magazine with the original MCI...

I'd go with the "MCI Swinging Op Amp" using a solo 5534. You might also try an NJM2114 there. They've got almost twice the output current of a 5532. Parallel the inputs of both sections and ballast the outputs through maybe 10-47R and you should be able to get 100-120 mA. Have the summed o...

Oh, so you want 100V? I did that when I was 17:

https://www.ka-electronics.com/DC_Pream ... 261974.jpg

This one is 70 V p-p. I made it ~100 Vp-p but it was a follower since more than about 70V exceeds the range of the op amp.

Do this with a pair of 5534s for balanced output. Note that Q1 is drawn with incorrect polarity. It should be an NPN. The base-collector capacitors, C114 and C115, are also incorrect and are 680 pF in the MCI. https://www.ka-electronics.com/images/jpg/MCI_Swinging_Op_Amp.jpg Image courtesy of MCI an...

I would go the power amplifier route. I think I have an HP200 with a high level option that might do it. Do you need +30 dBu or +30 dBm? You can get +27 dBu with a 1646. You might be able to squeeze +30 out of a good one using supply voltages above the absolute max and a heatsink. :geek: I actually ...

typed /K instead /L /K for kill? That's brutal. Roger - Does your keyboard have a Windows function key? That may be it to since IIRC it's by the spacebar. I use old geniune IBM keyboards that have the "Selectric" style tactile sensation. They don't have Windows Keys so I don't know what t...

Hmm... Sometimes in IE7 I hit a series of control or ALT keys which hits the back page button in IE or some other obscure function. It's very frustrating and I've lost a number of good posts that way by going back to the page where there's an empty edit box. It may be ALT-Backspace. I know that when...

Thanks for checking these. They're a little hard to find being that some distributors stock glass passivated rectifiers but mistakenly think that the "GP" suffix means general purpose. Digi-Key does that. So you don't really know what you're getting. The Vishay from Allied are the real dea...

That was the night I ended up driving up the 405 to make an early morning flight out of LA using braile (listening for the reflectors on the road surface to know when I'm out of my lane). JR Reminds me of a story of John Alderson of Studio Supply (Nashville) told me once. He and Stevie Wonder were ...

I think for a $12 lap dance I'd be willing to buy some Mexican "capacitros."

Group buy anyone?