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JFET-only Circlotrons without negative feedback.
JFET-only Circlotrons without negative feedback.
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Old 7th April 2021, 02:03 PM   #291
alexopth1512 is offline alexopth1512
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Join Date: Sep 2020
Location: Greece
Hello for stereo setup, two channels.

for the non high power rails, we can use the same PCB with common supply? I.e. connect both channels to same supply board?

We can do the same for the high power rails for each channel, or we have to have 4 separate rails for high power?
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Old 7th April 2021, 02:12 PM   #292
jpatay is offline jpatay  Ukraine
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The stabilized power supply can be one for two channels.
But it is better to have a separate stabilized power supply for each channel. Then there will be no background at all.
Yes, the output stages require 4 separate power supplies. One power supply is designed for one powerful transistor.
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Old 7th April 2021, 02:21 PM   #293
jpatay is offline jpatay  Ukraine
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For the output stage Mosfet:
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Old 7th April 2021, 03:02 PM   #294
gaborbela is offline gaborbela  Canada
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Interesting, great project, I want to follow.. Maybe build something.
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Old 7th April 2021, 03:04 PM   #295
jpatay is offline jpatay  Ukraine
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It would be very good.
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Old 7th April 2021, 07:28 PM   #296
alexopth1512 is offline alexopth1512
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Quote:
Originally Posted by jpatay View Post
For the output stage Mosfet:

Interesting. No stabilization eh? Only one capacitor? No humming, buzzing or something?

By the way, if we have small differences in voltage, wouldn't mean that some (minor) current would flow between the output FETs? Have you measured that?

I have received all JFETs. I have also designed a new PCB and a new stabilized PSU PCB (I like to build my own PCBs). PCB for amplifier has arrived, PCB for PSU will be ordered.

I am now wondering about the output stage. I have already a high power stabilized PSU (more than 10A) from another project and works great. But it will be huge to build it 4 times. I may try something in the middle, I ll design something.
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Old 8th April 2021, 05:09 AM   #297
jpatay is offline jpatay  Ukraine
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No need for stabilization output stage. There is also stabilization of the preliminary stage.
No noise is heard in the speakers. If you are using one power supply for the two pre-channels, then a slight buzzing sound may be generated.
The difference in the voltage value of the output stage is permissible, but if the voltage is high, then the Mosfets will heat up more.
One diode bridge needs 10,000 uF. I am waiting for the result of the amplifier assembly. Write about your work results.

Last edited by jpatay; 8th April 2021 at 05:20 AM.
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Old 8th April 2021, 07:51 AM   #298
jpatay is offline jpatay  Ukraine
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Quote:
Originally Posted by alexopth1512 View Post
I am now wondering about the output stage.
Output stage on P-channel Mosfet. (Example).
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