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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 3rd January 2012, 02:11 PM   #4721
merlin el mago is offline merlin el mago
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Ricardo if you can post pics.
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Old 3rd January 2012, 09:49 PM   #4722
RCruz is offline RCruz  Switzerland
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The simplistic Salas low voltage shunt regulator
Hi Merlin The simplistic Salas low voltage shunt regulator

This is what I have now... I will post more recent ones in near future... but there are only small differences (less 1 small EL cap)
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Old 4th January 2012, 07:48 AM   #4723
merlin el mago is offline merlin el mago
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Congratulations Ricardo, compact, nice & neat work.
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Old 4th January 2012, 05:38 PM   #4724
df_genius is offline df_genius  United Kingdom
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For those that might be interested I've had success in using these in my tape recorders. I've used them in Nakamichi 482, 482Z and one of my Akai GX-77's. The Nakamichi's in particular use a single 7824 to power pretty much the whole deck, and removing a link enables the 24V Salas reg to power the audio circuit alone. The Akai's need 10 and 24V regs, again easy to do but the bias circuit needs quite a bit of power so I had to leave this on the standard reg.

Improvements are not small at all and remove much of the analogue sound - the noise floor drops substansially and all frequencies are much cleaner and crisper. I just used V1 regs on strip-board, they are very easy to build and can be very compact if the layout is done properly.

Next up for Salas regs is my Nakamichi 680ZX and my main deck a 682ZX, and my main Akai GX-77. The 680 series decks use twin rails for the analogue circuits (-12/+12) for better performance than the cheaper decks.
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Old 4th January 2012, 06:31 PM   #4725
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
PSUs are a crucial part of many circuits total behavior indeed. Nice to hear you have found more applications and got positive results.
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Old 23rd January 2012, 06:26 PM   #4726
krivium is offline krivium  France
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Hi Salas and all,

i would like to build a Reflektor with load requiring 50V / 30ma.
Could you advise on modification of circuit please (first one i see is probably need to change transistor type, i have access to many different types like bc560, MJE350, ksa 1381,...).

Thanks
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Old 23rd January 2012, 06:31 PM   #4727
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
You would need a higher voltage/dissipation type. Use KSA1381. Next you would need a ring of two BJT CCS at about 2mA for the main CCS's tail, since the JFET won't take the max voltage. Use 60V or higher quick transistors. Last, your output voltage trimmer should be boosted up with a resistor in series for having high reach and to share dissipation. About 4mA run there, add 2Vbe and one LED Vf.
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Old 23rd January 2012, 06:34 PM   #4728
krivium is offline krivium  France
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Ok Salas, thank you answering so fast.
I'll study that and came back with a schematic to check.

Best regards.
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Old 23rd January 2012, 07:01 PM   #4729
krivium is offline krivium  France
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Quote:
Use 60V or higher quick transistors
i have acces 2sc2240 or bc 639. Are they ok?
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Old 25th January 2012, 05:19 PM   #4730
carlmart is offline carlmart  Brazil
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Are there any kits around, preferably on eBay, following the Salas design used here?
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