Particularly since we all have extra power amps laying around. I think the ratio of amp channels to speakers here is at least 5 to 1.I could scratch something up this weekend if there is interest, but probably not worth it for a one off.
Search found 5471 matches
- Fri Aug 21, 2009 9:48 am
- Forum: Pro Audio Design
- Topic: Boosting signal generator or op amp outputs to >+30 dBu
- Replies: 77
- Views: 130447
Re: Signal generator output ranges
- Thu Aug 20, 2009 4:46 pm
- Forum: Pro Audio Design
- Topic: Boosting signal generator or op amp outputs to >+30 dBu
- Replies: 77
- Views: 130447
Re: Signal generator output ranges
Just had an idea. Take this current booster circuit with a 1646 (shown below) and make it a swinging op amp by voltage bootstrapping the rails as in the MCI drawing: https://www.ka-electronics.com/images/jpg/THAT1646_Current_Boost.JPG This gives you lots of output current, the bootstrap transistors ...
- Thu Aug 20, 2009 3:44 pm
- Forum: Pro Audio Design
- Topic: Boosting signal generator or op amp outputs to >+30 dBu
- Replies: 77
- Views: 130447
Re: Signal generator output ranges
I used to write a column in RE/P so have some old issues laying around. John - Thanks for posting here in this neck of the woods. I think that ad ran in '77 or '78. MCI treated it like a major breakthrough. I think it was a cartoon but everytime I saw it I thought of Little Feat's "Dancing Sho...
- Thu Aug 20, 2009 9:42 am
- Forum: Pro Audio Design
- Topic: Boosting signal generator or op amp outputs to >+30 dBu
- Replies: 77
- Views: 130447
Re: Signal generator output ranges
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...
- Tue Aug 18, 2009 7:54 pm
- Forum: Pro Audio Design
- Topic: Boosting signal generator or op amp outputs to >+30 dBu
- Replies: 77
- Views: 130447
Re: Signal generator output ranges
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...
- Tue Aug 18, 2009 6:07 pm
- Forum: Pro Audio Design
- Topic: Boosting signal generator or op amp outputs to >+30 dBu
- Replies: 77
- Views: 130447
Re: Signal generator output ranges
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.
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.
- Tue Aug 18, 2009 3:01 pm
- Forum: Pro Audio Design
- Topic: Boosting signal generator or op amp outputs to >+30 dBu
- Replies: 77
- Views: 130447
Re: Signal generator output ranges
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...
- Tue Aug 18, 2009 2:58 pm
- Forum: Pro Audio Design
- Topic: Boosting signal generator or op amp outputs to >+30 dBu
- Replies: 77
- Views: 130447
Re: Signal generator output ranges
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 ...
- Wed Aug 12, 2009 4:43 pm
- Forum: The Peabody Lounge
- Topic: PM bug? Nah, clumsy user!
- Replies: 2
- Views: 8363
Re: PM bug? Nah, clumsy user!
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...
- Tue Aug 11, 2009 8:27 pm
- Forum: The Peabody Lounge
- Topic: PM bug? Nah, clumsy user!
- Replies: 2
- Views: 8363
Re: PM bug?
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...