Nice work Marc. Perfect match for your CFH9.
Thanks,
I should recieve today missing parts for CFH9 and Cap mu.
Marc
I have worked on something similar based on the ESP articles.
The obvious drawback is that they are slow. They are supposed to work nicely with steady loads, but even then we do not have perfect circuits.
If you perceive an improvement with output capacitors, then you might want to reconsider a few things.
One is that C multipliers are sensitive to modulation so use a separate one for each stage and channel. Another thing to care for is to use adequate and fast local decoupling to further help isolation and transient response.
A similar approach is proposed by John curl on the Blowtorch thread where he suggests using a chip reg for the V reference and get rid of LF noise, then use the multiplier to get rid of HF noise and noise from the chip, and then locally use an appropriate low impedance stage to care for transient needs.
The obvious drawback is that they are slow. They are supposed to work nicely with steady loads, but even then we do not have perfect circuits.
If you perceive an improvement with output capacitors, then you might want to reconsider a few things.
One is that C multipliers are sensitive to modulation so use a separate one for each stage and channel. Another thing to care for is to use adequate and fast local decoupling to further help isolation and transient response.
A similar approach is proposed by John curl on the Blowtorch thread where he suggests using a chip reg for the V reference and get rid of LF noise, then use the multiplier to get rid of HF noise and noise from the chip, and then locally use an appropriate low impedance stage to care for transient needs.
Here is what I got so far. Still working on it a bit
It is basically the mosfet circuit from ESP with the second order filter. I added the 1N4004 and the gate resistor. It's very close to Juma's
I have input/output caps on separate boards
If anyone is interested I will upload the eagle files
PS. There is a small error on how the zener is connected. I will fix it
It is basically the mosfet circuit from ESP with the second order filter. I added the 1N4004 and the gate resistor. It's very close to Juma's
I have input/output caps on separate boards
If anyone is interested I will upload the eagle files
PS. There is a small error on how the zener is connected. I will fix it
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It's great to see the Epcos caps in the build but even these still suffer from 'overdone' - try using much, much smaller caps on the output like 100, 220 or 470uF and try the Nichicon Bipolar in place of the Panasonics - those bigger Epcos caps are excellent as primary filter caps - the whole behaviour/sound of the supply will be quite different
my 2 cents ...
my 2 cents ...