Whats Wrong with the DC300A answer

Started by Phil Allison in sci.electronics.design2 years ago 4 replies

Hi to all the terminally puzzled, --------------------------------- THE *problem* with the Crown DC300A is simple, but virtually unknown...

Hi to all the terminally puzzled, --------------------------------- THE *problem* with the Crown DC300A is simple, but virtually unknown in the industry. Any amplifier that has response to DC is similarly questionable as being suitable or safe to use driving loudspeakers or transformers. Such amplifiers produce a large DC component when driven into clipping with an un


how can people post things this stupid?

Started by John Larkin in sci.electronics.design8 years ago 111 replies

http://www.eeweb.com/electronics-quiz/single-ended-push-pull-amplifier -- John Larkin Highland Technology...

http://www.eeweb.com/electronics-quiz/single-ended-push-pull-amplifier -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation


RE DIAC/TRIAC Light Dimmers

Started by Anonymous in sci.electronics.design7 years ago 1 reply

What do you think of impressing a DC voltage to the trigger circuit to make a low frequency amplifier ? I think such a thing could be used for a...

What do you think of impressing a DC voltage to the trigger circuit to make a low frequency amplifier ? I think such a thing could be used for a servo on a DC motor. Or is this one of those things that has already been done but I didn't know it ? Another question is about using a higher frequency to get some bandwidth. I asked that over in SED and had a nice bastardised hack circuit that h...


Connecting a Sub-Woofer for BOTH Channels

Started by Anonymous in sci.electronics.design5 years ago 18 replies

I have a small amplifier (about 15W per channel), that I use for my computer to listen to music. I have two speakers connected to it, which are...

I have a small amplifier (about 15W per channel), that I use for my computer to listen to music. I have two speakers connected to it, which are bookshelf sized speakers from an old stereo. It works well, but lacks bass. I just got a sub-woofer which came from some sort of home theater system. I want to connect this to what I already have. However, there is only ONE sub-woofer. How can I ge...


MPPC amplifier

Started by Fitzgerald in sci.electronics.design4 years ago 5 replies

I'm looking into low-light detection using MPPC's and I am testing using the Hamamatsu C12332-01 evaluation module. I am looking for general...

I'm looking into low-light detection using MPPC's and I am testing using the Hamamatsu C12332-01 evaluation module. I am looking for general hints, tips and tricks to maximize the performance of these modules. We'd like to have a measure for the total amount of photons collected every 20-100ns (exact timing t.b.d.) One of the things that surprised me was that the frontend of the eval...


amplifiers will, oscillators won't

Started by Gerhard Hoffmann in sci.electronics.design2 years ago 6 replies

I still have a skeleton in the cupboard and the current lock down seems fine to bury it for good. Let there be an amplifier consisting of...

I still have a skeleton in the cupboard and the current lock down seems fine to bury it for good. Let there be an amplifier consisting of one or more CS input JFETs, an optional cascode, an op amp for plenty loop gain and feedback into the source. Everybody and his dog does this, but it has a drawback: it is not stable. If you measure into the input, you see a capacitance in series wit...


Low bias current opamps

Started by Jeroen in sci.electronics.design9 years ago 36 replies

I was playing today with a little ionization chamber amplifier, which is an exercise in high-impedance design. My usual business revolves around...

I was playing today with a little ionization chamber amplifier, which is an exercise in high-impedance design. My usual business revolves around wideband RF amplifiers, so this is unfamiliar territory for me. I selected an LPC661 opamp which has a specified maximum Ib of 4pA, but with a typical value stated to be 2fA. That's a very large difference, which, I guess, is motivated by the need...


Paper on reducing 1/f noise in amplifiers

Started by Phil Hobbs in sci.electronics.design7 years ago 16 replies

AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. 164....

AoE 3 P. 485 (footnote 22) references a paper by Broderson, Chenette & Jaeger, entitled "A Superior Low Noise Amplifier", 1970 ISSC, P. 164. Before I feed yet another $31 into the voracious maw of the IEEE, does anybody have a copy handy? Thanks Phil Hobbs


"Class-AA" amp?

Started by DaveC in sci.electronics.design6 years ago 14 replies

...

http://www.ebay.com/itm/Class-AA-OP-Amp-Preamp-Headphone-Amplifier-Board-PCB- for-OPA2134-NE5532-AD827- /172014725981?hash=item280ce06b5d:g:XDIAAOSwp5JWXEQ4&autorefresh=true I?m no enjineer (c: but I?ve never heard of ?AA?. Is it dry? (That?s a joke?)


"Class-AA" amp?

Started by DaveC in sci.electronics.design6 years ago

I?m no enjineer (c: but I?ve never heard of ?AA?. Is it dry? (That?s a joke?)

I?m no enjineer (c: but I?ve never heard of ?AA?. Is it dry? (That?s a joke?)


Educated Guess (audio levels)

Started by Cursitor Doom in sci.electronics.design8 months ago 4 replies

Gentlemen, Say I hook a dynamic mic up to a voltage amplifier of 1M+ Zin. The amp provides a gain of around 650. Could I reasonably expect to...

Gentlemen, Say I hook a dynamic mic up to a voltage amplifier of 1M+ Zin. The amp provides a gain of around 650. Could I reasonably expect to hear some (albeit very low level) output if I tap the mic with my finger whilst listening for an output signal with xtal earpiece? Thanks.


THD measurement

Started by John Larkin in sci.electronics.design5 years ago 54 replies

Another customer wants us to measure the THD of a wideband (70 MHz maybe) amplifier that we are proposing. They want under 60 dB distortion...

Another customer wants us to measure the THD of a wideband (70 MHz maybe) amplifier that we are proposing. They want under 60 dB distortion at 10 MHz, under 80 dB at 1 MHz. Aside from the very possibility of doing this, how the heck can I measure it? There is, incidentally, no reason, in the system, to need this sort of performance. They just want it. I'd need a source with super low...


Diode and capacitor on mains input

Started by Anonymous in sci.electronics.design7 years ago 11 replies

I'm fixing a B & O amplifier, a pleasure due to the clear schematics supplied with it but do not understand one little area. In series with the...

I'm fixing a B & O amplifier, a pleasure due to the clear schematics supplied with it but do not understand one little area. In series with the mains input there is an electrolytic and a pair of back to back diodes all in parallel. What is this for ? Excuse the poor ASCII art. ---| |--- | | ---||--- Jon


Sziklai Squared ??

Started by Jim Thompson in sci.electronics.design6 years ago 10 replies

Seeking a simple unity-gain amplifier with which to make an S-K lowpass filter I came up with this as I compressed functions... ...

Seeking a simple unity-gain amplifier with which to make an S-K lowpass filter I came up with this as I compressed functions... ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Anal


Relay DC protection

Started by Phil Allison in sci.electronics.design9 years ago 1 reply

Hi, following on from the "Relay contact rating" thread - here is a neat page on the use of small relays to protect loudspeakers from...

Hi, following on from the "Relay contact rating" thread - here is a neat page on the use of small relays to protect loudspeakers from being destroyed by a faulty amplifier. Many stereo amps have relays to eliminate annoying switch on and off noises and most of them disengage the speaker if a significant DC voltage is detected on the output of one or other amp channel. However...


Switching amplifier outputs

Started by Don Y in sci.electronics.design5 years ago 7 replies

I need to drive a speaker from either of two sources (2-8ohm, 15-25W, BTL) Obviously, select a break-before-make contact...

I need to drive a speaker from either of two sources (2-8ohm, 15-25W, BTL) Obviously, select a break-before-make contact configuration. But, how concerned should I be about ensuring that both driving sources are "off" at the time I toggle the relay? The relay's function is only invoked very rarely -- maybe weeks or months between "events". Or, is it better to use a pad to mix them (...


OT: Anyone remember this vintage audio amp?

Started by Chris in sci.electronics.design2 years ago 21 replies

Hi all, Without venturing into 'stupid money territory' the best quality audio by far I've ever heard came from one particular solid state...

Hi all, Without venturing into 'stupid money territory' the best quality audio by far I've ever heard came from one particular solid state stereo amplifier I'd be interested in re-acquainting myself with. Unfortunately I can't recall the make or model number which is obviously a big barrier to the desired reunion. However, if I mention some scant details I *do* remember about it, mayb...


Spot the Design Error

Started by Phil Allison in sci.electronics.design2 years ago 72 replies

Hi to all my pals, a certain "design genius" here called John thinks any clever engineer can quickly decide if a design is good or otherwise...

Hi to all my pals, a certain "design genius" here called John thinks any clever engineer can quickly decide if a design is good or otherwise by assessing only a schematic. I say that is bollocks, maybe a simple test will make my point. -------------------------------------------------------------- This schem is for the famous Yamaha P2200 power amplifier sold in large numbers thro...


Using CMOS logic for amplifying small signals

Started by Mr. B in sci.electronics.design14 years ago 16 replies

Something has occurred to me, and I was wondering if anyone knew more about this. Could a CMOS logic inverter, like a 4049, be used as a very...

Something has occurred to me, and I was wondering if anyone knew more about this. Could a CMOS logic inverter, like a 4049, be used as a very high gain amplifier if it were properly biased? I figured that the DC offset should be set at just about half the supply voltage, so that the gate was always between a '1' and a '0'. I am not sure if the gate would behave linearly in that region, or...


precision low cost isolation amplifier

Started by John Larkin in sci.electronics.design3 years ago 18 replies

https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki 2LfCgmz7yeO868%3D -- John Larkin ...

https://www.mouser.com/ProductDetail/Texas-Instruments/ISO120SG?qs=sGAEpiMZZMtyhvbnOfCRF6Da9Qaki 2LfCgmz7yeO868%3D -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com