I am using the high-power amps with 100V rails version.
The corresponding diodes might be D5 and D7..... I did not use those in my breadboard build
The corresponding diodes might be D5 and D7..... I did not use those in my breadboard build
Conserning cap multiplier section,use 3 x 1N4148 in series for your D8 as shown on web page The K Multiplier.
Hi Kean
Reworked the layout now using your simplified schemetic. Trying to follow your board layout I included a copper pour connected to GND.... your comments are most welcome here as I do not have enough experience on how to use gnd planes.
Best Ricardo
Reworked the layout now using your simplified schemetic. Trying to follow your board layout I included a copper pour connected to GND.... your comments are most welcome here as I do not have enough experience on how to use gnd planes.
Best Ricardo
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Looks reasonable to me. PSRRs add when you put regulators/KMs in series. Of course at some point EMI will cause more noise than is getting through your regulators.
Few here use ground planes, the important thing is to just not create large current loops when small current loops will do. If you can do a good one-sided layout, then using ground planes starts being a good idea. I don't think they are much of an improvement the way you are using them.
It's hard to figure out your layout without seeing the whole board. And I'm not really in a good position to teach this stuff. If others here can't find flaws with the board, then you will probably be satisfied with it. There is no guarantee that my advice won't just confuse you and cause you to make a worse layout.
Earlier you mentioned for the standard KM the safety diodes can be omitted. Would this also apply for the HV-version?
Thanks Kean. I know it is still simulation but if I don't add a Cap after the CFP the output impedence is significantly high. Why is that?
I put 820u for C1 in the original schematic, that would help. Like any C multiplier, there is some rise in output impedance at LF. It sounds fine though apparently.
Using BC550C/560C with higher Hfe and loading with 100mA or so would reduce it further.
Using BC550C/560C with higher Hfe and loading with 100mA or so would reduce it further.
Kean, Thank you! What are the qualities of Transistor that works best in your CFP? Other than HFE?And which Transistor Q3 or Q4 in my schematic?
I may need about 110 mA for my project.
I may need about 110 mA for my project.
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zener follower with CFP
while waiting for a reply I experimented with another design and got this. But for some reason I have to use 10x capacitance to get the same PSRR.
Please get the models from here
http://www.cordellaudio.com/book/Cordell-Models.txt
while waiting for a reply I experimented with another design and got this. But for some reason I have to use 10x capacitance to get the same PSRR.
Please get the models from here
http://www.cordellaudio.com/book/Cordell-Models.txt
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oops.That fixed it. Kean what do you think about making virtual ground with your CFP as in post #1056
The amplifier's output Zobel is predominantly an HF load.
10ohms+100nF has an F-3dB frequency of 159kHz.
The load presented to the amplifier at this frequency is ~14ohms.
Significant VHF current can only flow through the output Zobel if the impedance at these high frequencies is maintained to a very low level.
This cannot happen if you take the output Zobel route on a tour around the amplifier to tie into some remote star.
The impedance can only be kept low by placing the output Zobel in a short compact LOW LOOP AREA route around the output devices and HF decoupling.
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