Dude, ever since we got broadband porn, everyone works from home. I thought everyone knew this. Apparently some 66% of visits to porn sites occur during office hours. "You are held in a queue. Your call is important to us. Please stay on the line" suddenly takes on a whole new meaning, do...

Too many people making very slightly different comments so I'll add one more clarification then bow out. If the speaker resistance is lower than the amp's rating it may well deliver the power, but have an extremely short life as it stresses various parts and overheats.. I think shufflebeat tried to ...

KISS principle :) Unless you have a very special setup and know exactly what you're doing, all speakers should be the same impedance and power rating. 2 Speakers in series: Amp sees twice the impedance so delivers half the total power, shared equally between the speakers. Each now gets a quarter of ...

I don't have the space
I don't have the time
I don't have the money

So, will you lot stop rattling my cage

P.S.
I can't help it, I just have to look

So at zero resistance you have 100% feedback and zero output, is that it? Thanks again. Bill Nearly :) You have 100% feedback alright , but x1 output - it becomes a simple voltage follower. But look at those input resistors, their ratio gives about x20 attenuation, hence the output is attenuated by...

Best not mention Linux then, they'd probably send the heavy mob round

{drool}

As Hugh said, yes, and yes. However... I wouldn't recommend doing output control that way, because you'd lose your overload margin. If you had the output control halfway then the Op Amp would still be able to deliver 9V (from a PP3) but you would only be able to drive your load to 4.5V. A better way...

OK, drawing is here . I've shown three inputs, but you can add more. This is not a true summing amplifier, so there will be a very small amount of interaction between the inputs. The output can go from zero to the full supply voltage and is pretty short circuit proof. Overdriving the inputs won't do...

When thinking about responsiveness, instead of total storage used, the number of separate files and the complexity of the directory structure can make a lot of difference, especially on well used hard drives. File "aardvark" in directory "abacus" is not necessarily the first item...

Seriously impressive. Best of luck.

In that case, if you are happy with about 5% accuracy you can use an even simpler circuit than the ones you found. There is a chip the Texas Instruments LMC6041, that is low current and will work very comfortably from a single supply such as a PP3. At around £1.50 its twice the price of your bog sta...

Does it actually need + and - voltages? If not, a very simple single OpAmp circuit run from a single rail supply will do the job and be reasonably accurate. If you need both swings then you need dual rail supplies. A slightly more complicated circuit using a twin OpAmp package will be very accurate ...

Nicely planned out work there (soldering looks good too). When having to use caps laying down like that on surface pads I usually put a tiny dollop of silicon on the other end for extra support.

Hollowsun, thanks for an excellent post. I am just not sure, though, that having to wear so many caps these days (writer, player of various instrumentals - real or virtual - and arranger, recording engineer, mixer, maybe mastering) has maybe not done things any favours Absolutely agree. The good th...

If it were mine, I'd simply solder on a pair of tails, sleeve them and gob in some silicon sealant, then fit a decent non-reversible in-line plug and socket to something like a 12V 1A wall wart. Would you please explain that Folderol? I can solder, but not sure what a 'tail' is - my apologies... I ...

That has to be just about the most stupid fault prone power connection I've ever seen

If it were mine, I'd simply solder on a pair of tails, sleeve them and gob in some silicon sealant, then fit a decent non-reversible in-line plug and socket to something like a 12V 1A wall wart.

Tried them. Didn't like them, went back to sniffing flux fumes

I'm curious what's the difference between 450W/160W-RMS and 500W/160W-RMS... Not sure of the context here.. but if two amps have the same output power rating and different input power ratings then one is probably more efficient than the other! H A rider to this... (if you don't mind) More efficient...

Warning: Non expert speaking! It looks eminently repairable to me. The fact that it right on the edge suggests that it wouldn't be subject to as much flexing as the rest of the cone gasket. I would also wonder why it was torn. Was it knocked by something? If not, there may be a more serious underly...