The simplistic Salas low voltage shunt regulator - Page 79 - diyAudio
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Old 23rd July 2009, 07:28 PM   #781
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no, no Buffalo again I know my regulator is working OK.

5V can be used almost anywhere. I want to try this regulator in different circuits and comparing to other regulators.

Also want to try some mods, like replacing Q1 MOSFET with transistor.
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Old 24th July 2009, 03:35 AM   #782
Salas is offline Salas  Greece
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Great. Try whatever you have in mind and let us know. The more we try the more we know. Thanks.
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Old 24th July 2009, 08:27 PM   #783
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@salas
look at this "Fetlington" http://www.teddypardo.com/Articles/SuperTeddyReg.html
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Old 24th July 2009, 08:30 PM   #784
Salas is offline Salas  Greece
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Its a well known very good SERIES circuit. Here we deal with a shunt circuit.
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Old 24th July 2009, 08:33 PM   #785
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I know.
I was thinking of replacing first MOSFET with transistor, leaving second MOSFET.
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Old 24th July 2009, 08:44 PM   #786
Salas is offline Salas  Greece
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Why don't you listen to it first and then make the change so to compare subjectively too? Just use 1 LED instead of three and a sinked BD140, emitter towards R1. Only make R1 3R3 or lower to maintain over 150mA in the CCS. Measure the drop across it to determine its value for the current you like. Keep it at double your audio circuit steady state need.
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Old 25th July 2009, 01:58 AM   #787
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I will first listen to original version (yours) & compare to SuperTeddyReg. After that will replace first MOSFET with transistor & listen again.

I am without DAC right now, both my DACs are at my friends. Shoukl have them back on Sunday.
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Old 25th July 2009, 04:22 AM   #788
prakit is offline prakit  Thailand
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Quote:
Originally posted by Spartacus



5.6V is actually rather low for the Buffalo. The supply feeds an LM4562 opamp that acts as a regulator, and it'll perform better with more volts across it. You should be looking at around 7V or more.

I think the LM4562 opamps are for balance to single-end conversion in the I/V. The regulators are LT1763 which is said to config for 1.2V output. These aret low dropout type. TP recommends the digital supply not to exceed 7.5V otherwise these SO-8 reg will get too hot.

While I am planning to rework the shunt reg per received advices, I put the Jung/Didden back on for reality check. It confirms my initial finding.

Best
Prakit
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Old 25th July 2009, 04:31 AM   #789
Salas is offline Salas  Greece
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3X1V8 Leds sitting on Vbe will get you to 6V2 out. This is good for giving space to Q3 as well. Cathode down orientation for the Leds, for Jfet underneath, wire D,G, together, D facing up to the Leds.
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Old 25th July 2009, 12:08 PM   #790
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Quote:
Originally posted by prakit



I think the LM4562 opamps are for balance to single-end conversion in the I/V. The regulators are LT1763 which is said to config for 1.2V output. These aret low dropout type. TP recommends the digital supply not to exceed 7.5V otherwise these SO-8 reg will get too hot.

While I am planning to rework the shunt reg per received advices, I put the Jung/Didden back on for reality check. It confirms my initial finding.

Best
Prakit
Hi Prakit
sorry to slightly off topic question here-
What are your impression of Borbley Shunt Regulator and whare are you using ? I am thinking of trying out this shunt on a Nakamichi 1000ZXL playback amp as it handles low voltages like a Phono section and require a high qulaity power-supply.
thanks in advance for your resposnse
Salas - appreciate your help in designing a simple practical Hi quality design
SK
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