Hi Merlin http://www.diyaudio.com/forums/powe...-voltage-shunt-regulator-470.html#post2843912
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)
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)
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.
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.
PSUs are a crucial part of many circuits total behavior indeed. Nice to hear you have found more applications and got positive results.
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
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
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.
Ok Salas, thank you answering so fast.
I'll study that and came back with a schematic to check.
Best regards.
I'll study that and came back with a schematic to check.
Best regards.
No in general, 1.1BIB in GB for pcbs sometimes here in DIYA, but you missed last one by a week late. Make reflektor on matrix board its the easiest.
Only if you can cool Q3 with TO-92 minisinks. Its a matter of dissipation for that high Vout. The others in the current mirror don't suffer as much voltage drop.
My problem is sourcing the parts from Brazil can be difficult and expensive.
If I can get all the parts from one place, then projects can be accomplished.
If I can get all the parts from one place, then projects can be accomplished.
Reflektor has the easiest parts. Almost any pnp transistor type and two very well stocked mosfet types. For its Jfet you can use many types. State the application (Vout, current, type of machine) so I can give you more precise info.
Reflektor is a company? I couldn't find it in Google.
I should be buying a JC-2 preamp kit in eBay this week, and it does carry a shunt supply on-board. So I thought I might replace it with a better shunt, and I thought of yours. What do you think?
I should be buying a JC-2 preamp kit in eBay this week, and it does carry a shunt supply on-board. So I thought I might replace it with a better shunt, and I thought of yours. What do you think?
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Start with that one and get a 1.1 BIB at a point when there will be another GB if you are ready made PCB minded. Then you can tell for differences yourself.
*Reflektor is one shunt design of mine based on current mirror principle.
*Reflektor is one shunt design of mine based on current mirror principle.
Yes.. no mosfets and a zener for Vref .... you will be astonished when you build the bib
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