Parallel - continuing with "current drive" concept
My God!
Please somebody stop me!
Following "Diagonal", here comes another relatively simple "current drive" design - I called it "Parallel".
Highly linear front-end, relatively low feedback loop gain (~35db), excellent stability margins, wide open loop bandwidth - hence low distortion distortion is almost constant within the audio frequency range (THD1 = 0.002%, THD20 = 0.003%).
Pretty nice harmonics profile (attached) - mostly 2 and 3 are in place.
It can be adapted to variety of rail voltages and also can be used with MOSFET output stage. Not live-tested yet.
Cheers,
Valery
My God!
Please somebody stop me!
Following "Diagonal", here comes another relatively simple "current drive" design - I called it "Parallel".
Highly linear front-end, relatively low feedback loop gain (~35db), excellent stability margins, wide open loop bandwidth - hence low distortion distortion is almost constant within the audio frequency range (THD1 = 0.002%, THD20 = 0.003%).
Pretty nice harmonics profile (attached) - mostly 2 and 3 are in place.
It can be adapted to variety of rail voltages and also can be used with MOSFET output stage. Not live-tested yet.
Cheers,
Valery
Attachments
Luxman used this kind of topology ("parallel" current subtraction via common base cascade and current mirror at the bottom) with some variations in a number of amplifiers, but always having jFET-based LTP at the input. AD797 - never paid attention, but that's cool
Yes of course,just a question.Cool, it has arrived! Now you have some work to do!
What are you using for smd solder?
Are you using solder paste or solder wire?
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I'm looking for a suitable heat sink and i want your help.Please have a look here.Go through pages and help me choosing the right one.You've got some brand new stuff there! Very interesting to see the tests
MAR electronics - ???????? - Standard Extruded Heatsinks 1
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Estimeted delivery time is 5-6 weeksThanks,Jef i hope my supplier can import this from Germany.
Cost for 2 pieces is 150€
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Diy is a very expensive hobby here especialy if you haven't good friends.
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Low cost heat sinks is the eternal enemy of DIYers.
If looks did not matter - a very low cost source of heatsinks are old aluminum cook pots. A 10in dia thick aluminum pot can probably serve as a good sink for a 250w class amp. Put some water in it and good for 2kW
Other place to check are industrial building supplies where they make aluminum in scaffolding. Or aluminum extrusions for factory automation. They sell by the foot or meter. A 100mm square profile aluminum Bosch rail with channels for T nuts may also make a good sink.
Bosch Rexroth:
This profile is 25mm x 50mm x 1.82 meters long for about $40.
https://www.zoro.com/8020-framing-extrusion-t-slotted-10-series-1020-black-72/i/G6676871/
If looks did not matter - a very low cost source of heatsinks are old aluminum cook pots. A 10in dia thick aluminum pot can probably serve as a good sink for a 250w class amp. Put some water in it and good for 2kW
Other place to check are industrial building supplies where they make aluminum in scaffolding. Or aluminum extrusions for factory automation. They sell by the foot or meter. A 100mm square profile aluminum Bosch rail with channels for T nuts may also make a good sink.
Bosch Rexroth:
An externally hosted image should be here but it was not working when we last tested it.
This profile is 25mm x 50mm x 1.82 meters long for about $40.
https://www.zoro.com/8020-framing-extrusion-t-slotted-10-series-1020-black-72/i/G6676871/
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There are DIY options for heatsink that work very well. I have sheet metal equipment and milling machines so it's easy for me to have excellent results, but the same can be done with a table saw and a belt sander.
DIY Heatsink
DIY Heatsink