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Amplifier power
On Fri, 17 Oct 2008 13:20:45 +1000, "Mr.T" MrT@home wrote:
"Arny Krueger" wrote in message ... BTW Marky, the trip down memory lane was fun for me, but have you ever heard of google? ;-) Obviously not, or he just prefers others to do it for him, and you were happy to oblige. MrT. Never thought of googling them actually. I'm a bit slow in that respect :-) Marky P. |
Amplifier power
Chronic Philharmonic wrote: "Arny Krueger" wrote "Marky P" wrote LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. True but it DID get used in audio. Its companion, the 748 was uncompensated internally (like the 5534 vs the 5532) and always seemed less noisy to me, so I used quite a few of those. Graham |
Amplifier power
In article , Eeyore wrote:
Chronic Philharmonic wrote: "Arny Krueger" wrote "Marky P" wrote LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. True but it DID get used in audio. Its companion, the 748 was uncompensated internally (like the 5534 vs the 5532) and always seemed less noisy to me, so I used quite a few of those. The RC4136 was used in a lot of stuff. It had a faster slew rate, and I measured up to 1.8 v/us, and was called a quad 741. Weird pins too. greg |
Amplifier power
"Eeyore" wrote in
message Chronic Philharmonic wrote: "Arny Krueger" wrote "Marky P" wrote LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. True but it DID get used in audio. Its companion, the 748 was uncompensated internally (like the 5534 vs the 5532) and always seemed less noisy to me, so I used quite a few of those. The on-chip compensation cap for the 741 was a well-known source of noise. LM301s were another alternative once the market matured some more. I believe that the integrated preamp/crossover for the original Infinity Servo-Static system used 741s. As others have pointed out, their slew-rate limitations were not that bad if you were running them at usual consumer levels like 1.5 volts RMS. |
Amplifier power
In article , "Arny Krueger" wrote:
"Eeyore" wrote in message Chronic Philharmonic wrote: "Arny Krueger" wrote "Marky P" wrote LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. True but it DID get used in audio. Its companion, the 748 was uncompensated internally (like the 5534 vs the 5532) and always seemed less noisy to me, so I used quite a few of those. The on-chip compensation cap for the 741 was a well-known source of noise. LM301s were another alternative once the market matured some more. I believe that the integrated preamp/crossover for the original Infinity Servo-Static system used 741s. As others have pointed out, their slew-rate limitations were not that bad if you were running them at usual consumer levels like 1.5 volts RMS. The more recent NHT pro monitors used RC4136's in the active stages. greg |
Amplifier power
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Amplifier power
GregS wrote: The more recent NHT pro monitors used RC4136's in the active stages. You HAVE to be kidding ! Graham |
Amplifier power
GregS wrote: Eeyore wrote: Chronic Philharmonic wrote: "Arny Krueger" wrote "Marky P" wrote LM741 (pretty sure this is an op amp) Yup and a real oldie. Slow and noisy, not to mention power hungry and a weak output for what it does. This was arguably the "breakthrough" IC op-amp. It was one of the first popular devices that was actually a monolithic design, and not a hybrid like some of the original Burr Brown modules. It was compensated for unity gain, which made it much too slow for anything but a buffer for audio work. It had a slew rate of 0.5 volts/microsecond. With a +/- 12 volt power supply, 6 kHz rail-to-rail was about it for non-slew rate limited signals. You could get 20KHz through it if you were content with about 4 volts peak. I think it had more applications in analog computing, integrators, low frequency function generators, servo controls, etc. True but it DID get used in audio. Its companion, the 748 was uncompensated internally (like the 5534 vs the 5532) and always seemed less noisy to me, so I used quite a few of those. The RC4136 was used in a lot of stuff. It had a faster slew rate, and I measured up to 1.8 v/us, and was called a quad 741. Weird pins too. I know the one. Avoided it like the plague if only for the pinout ! Didn't TI make a TL075 with the same pinout ? Graham |
Amplifier power
Arny Krueger wrote: "GregS" wrote (GregS) wrote: The more recent NHT pro monitors used RC4136's in the active stages. I was talking about the Ken Kantor pro speakers. I have the schemtics for the A10 and A20 amplifier-equalizers here before me. They are loaded with 4558s, no 4136s in sight. I looked inside my A10 and found that they were indeed 4558s. YUK ! Pro ? That's a joke. When were these designed ? At least drop some 4560s in. Graham |
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