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Old 9th October 2017, 08:12 PM   #1141
2 picoDumbs is offline 2 picoDumbs  Australia
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I'm just being a clown. Hahaha
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Old 9th October 2017, 08:13 PM   #1142
2 picoDumbs is offline 2 picoDumbs  Australia
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No I'm not.
Safety in numbers.
Thanks ZM
Haha
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Old 11th October 2017, 12:40 AM   #1143
lhquam is offline lhquam  United States
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Quote:
Originally Posted by 2 picoDumbs View Post
No I'm not.
Safety in numbers.
Thanks ZM
Haha
Push "Safety in numbers" to the limit with 10000 JFETs!
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Old 15th October 2017, 12:33 PM   #1144
2 picoDumbs is offline 2 picoDumbs  Australia
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10kHz square wave
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File Type: jpg 20171013_164311.jpg (475.9 KB, 347 views)
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Old 15th October 2017, 02:20 PM   #1145
formantjim is offline formantjim  Canada
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Nice!

I was getting a bit worried by the route this thread was taking as it was "The F4 Beast" after all and we appear to have lost some of the "Beast" part with the smaller output devices.
I'm currently working on another project so I have not made my stereo "Hockey Puck" (with your temp compensation circuit) amplifier running 12A bias yet but once I finish I will post pictures.

Keep up the excellent work.
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Old 10th January 2018, 06:26 PM   #1146
woofertester is offline woofertester  United States
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Just finished reading this thread. A truly awesome collection of efforts and knowledge.

The attached is a different front end driving much the same output devices as in this thread. I am wiring up a breadboard to see if I can get the amp biased and get an output. LT Spice says that about 8.2 v p-p from +/- 5V rails before clipping.

The amp is intended to drive low a resistance ribbon directly.

indra1 set this up in LTSpice and got it dialed in for bias and offset. Many thanks to him.

I am looking for a pair of the hockey pucks that do this job and the P channel units are far behind the N channel units for RDSon.
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File Type: pdf High Current Ribon Amp R1.pdf (15.9 KB, 64 views)
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Old 10th January 2018, 07:13 PM   #1147
2 picoDumbs is offline 2 picoDumbs  Australia
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5V rails are ok for testing but you don't want to use 5V in the finished amp.
The capacitance values are terribly non-linear in that region.
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Old 10th January 2018, 07:24 PM   #1148
Zen Mod is offline Zen Mod  Serbia
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there is a hope that that non-linearity is exactly the same , but opposite in sign , with nonlinearity of ribbons ?

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Old 10th January 2018, 07:48 PM   #1149
2 picoDumbs is offline 2 picoDumbs  Australia
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That's a lot of trial and error to make it work.
I think you would need an asymmetric single ended source follower arrangement for this to work, but I'm just guessing.
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Old 10th January 2018, 08:11 PM   #1150
woofertester is offline woofertester  United States
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Quote:
Originally Posted by 2 picoDumbs View Post
5V rails are ok for testing but you don't want to use 5V in the finished amp.
The capacitance values are terribly non-linear in that region.
The capacitances of the hockey pucks or the capacitances of the front end transistors?
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