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op-amp based, high-gain, high rail voltage, preamp
op-amp based, high-gain, high rail voltage, preamp
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Old 25th November 2017, 08:43 PM   #41
traderbam is offline traderbam  Europe
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Quote:
Originally Posted by jcx View Post
beware trying to sim, most macro models don't correctly show PS pins affecting compensation when in real 5-pin op amps the Cdom is connected to one of the PS rails
Sage advice.
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Old 26th November 2017, 04:17 AM   #42
PRR is offline PRR  United States
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Originally Posted by CharlieLaub View Post
...lots of output voltage capability that can be used to drive unity gain amplifiers....
To state the obvious: what you want is a classic transistor Power Amp, minus the output stage. Such things are easily built and easy to find plans for; re-rig the output side minus the power stage.

Specifically the MoFo: its input is such an easy drive that you probably only need input pair and the VAS stage, no emitter followers or their bias.
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Old 5th December 2017, 07:34 AM   #43
JonPike is offline JonPike  United States
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Hi Charlie and the thread...

Now that you have 15 suggestions to do this, why not a 16th?

Actually, this might be interesting for a topology suggestion. I like the linear pot providing a log slope trick. With a bit of design work (even virtual with LTSpice) it might be adjusted for 0-20dB, rather than -20dB-0dB. That, and a higher rail opamp, and you're good to go... Too bad TI isn't selling boards for this, pretty simple layout though...

http://www.ti.com/lit/ug/tidu034/tidu034.pdf
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Old 5th December 2017, 02:49 PM   #44
BesPav is offline BesPav  Russian Federation
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Originally Posted by JonPike View Post
With a bit of design work

You can achieve pretty logarithmic regulation a step better than best log potz could achieve with only linear potz.

IMG_5322.JPG
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Old 6th December 2017, 10:08 PM   #45
jackinnj is offline jackinnj  United States
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op-amp based, high-gain, high rail voltage, preamp
Quote:
Originally Posted by PRR View Post
To state the obvious: what you want is a classic transistor Power Amp, minus the output stage.
LM4702, LME49830, LME49810, LME49811 -- all gone to heaven, but still available if you look.
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Old 8th December 2017, 01:56 AM   #46
georgehifi is offline georgehifi  Australia
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Quote:
Originally Posted by 00940 View Post
If "high voltage" is only +/-24v, the opa604 has no problem with it. But it's not able of a rail to rail output, so you'll be limited at about 42vp-p
This OPA604 (low distortion, low noise, high slew rate, unity gain stable) with + - 24v rails seems to me to be the simplest way of getting high gain high output. Which is what the title is? And it comes in an identical dual OPA2604, But I like the single as you can direct couple it and have DC Offset trim on it.

"op-amp based, high-gain, high rail voltage, preamp"

Don't know why everyone is intent on complicating things.

Cheers George
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Old 8th December 2017, 04:58 AM   #47
mchambin is offline mchambin  France
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LME49860 is +&- 22V Rail to rail.
See here about measured performance of this op amp.
Bridged Buffered Opamp Amp - a journey
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Old 8th December 2017, 05:14 AM   #48
georgehifi is offline georgehifi  Australia
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No dc offset trimpot pins, very important to me as I dislike coupling caps.

Cheers George
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Old 8th December 2017, 05:20 AM   #49
mchambin is offline mchambin  France
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Low offset. It does not need a trimpot in this audio application: Bridged Buffered Opamp Amp - a journey
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Old 8th December 2017, 07:00 AM   #50
georgehifi is offline georgehifi  Australia
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Quote:
Originally Posted by mchambin View Post
Low offset. It does not need a trimpot in this audio application: Bridged Buffered Opamp Amp - a journey

Bet it's got some, never seen one yet that's only a couple of mV. And it's going to compound anything that the input sees from the source as well, with all that gain.

Cheers George
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