Using the HYPNOTIZE as a general shunt reg PCB - Page 3 - diyAudio
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Old 29th November 2009, 08:29 AM   #21
Salas is offline Salas  Greece
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Nice. I used 2A for the 13V model. Don't know about the cap on the amp, I guess its a worthwhile experiment to get it out and use 1uF film there for decoupling only. I would try up to 15.000uF smoothing cap for the rectification stage for 2A constant current. I guess you will find your best sonics by changing some values and types for that. Depends a lot on the impedance of your speakers and how loud, music types you listen to, etc.
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Old 29th November 2009, 12:59 PM   #22
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From what Borbley' suggestion - very large stiff powersupply caps will benfit this application ( Shunt regulators). You should try as much as 30000 MFD. Also good quality Cap will show its merit
kannan
PS I am planning to make one set of +/- 24 V very soon using this board
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Old 1st December 2009, 09:40 AM   #23
Ian444 is offline Ian444  Australia
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Thanks for your help, I put 13000uF on it, couldn't tell a lot of difference, but I guess with the bench supply output caps and the 4700uF on the amp PCB, who would know what happens. It sounds fantastic as is, so I will get a power tranny, build the rectifier and lay it out as it should be, go for approx 13V @ 2A, let it break in fully and tweak from there. If it sounds as good as it does now when its finished, I will be very happy

Kannan, I will be attempting a +12/+20V supply for a Monica/Mojo DAC next, proly in the next month or two. It looks quite feasible to make the negative reg a positive one, to accommodate dual positive supplies, using Salas' method of tying gate to source on the 2SK170 before inserting them backwards (for the neg rail positions that is). Very versatile...
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Old 14th December 2009, 07:21 AM   #24
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Salas

would you please recommend good brand smoothing cap and value also rectifier to be used to power dac chips (with Hypnotize or with LM317 / 337)
I am planning to get Nichicon but they are so many types (KG, FG, KW, PW)
with rectifiers people say hexfred but what brand and model
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Old 14th December 2009, 07:29 AM   #25
Salas is offline Salas  Greece
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KG

Rectifiers that fit directly on the Hypno PCB? Then the MUR are OK. Or some TO-220 quad (or dual if 2 in package) with some makeshift add on perfboard adapter? Then see about Stealth series. Whatever you gonna get, see it is soft recovery always, that parameter is important.
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Old 16th December 2009, 10:18 AM   #26
Ian444 is offline Ian444  Australia
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I tried a SMPS 24V 3A to power the Hypnotize for the T-amp. Set it to 21V, adjusted the CCS to 2A and output voltage to 13.8V. Removed the 4700uF from the TA2020, put in 10uF but should have been 1uF. The SMPS would not start with 13000uF at the front of the Hypno so I reduced it to 6600uF then no problems. Sound is the best so far. Very nice to listen to, more detail, very good indeed.

The reason I tried a SMPS to power it, is that I can't find a 150 to 200VA EI tranny with the correct output voltage, and the SMPS was $22 delivered. So decided to try something different and see what happens. Nothing getting too hot, not heatsink, nor SMPS.

Ian.
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Old 16th December 2009, 01:07 PM   #27
Salas is offline Salas  Greece
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Is it the SMPS or is it taking out the local big cap responsible for the better sonics?
Did you do any comparison with the previous feed, but with that cap out?
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Old 17th December 2009, 08:26 AM   #28
Ian444 is offline Ian444  Australia
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I retraced my steps this afternoon, back-tracked a bit, did some comparisons. Removing the local big cap is what makes it sound much better. I have 2 identical T-amp PCB's, one with the big cap and one without big cap, makes it quick to compare. I ask my wife to help when doing A/B comparisons, 4 ears better than 2. Then we found the bench supply sounds better than the SMPS, a more realistic sound, so I guess I should look for a suitable tranny. The heatsink will take a bit more power yet, so there is still a bit of room to play with input voltages.

So the SMPS seems not the best way to go, nor the big cap on the T-amp, as you suspected I believe...thanks for asking those questions, I learned something
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Old 17th December 2009, 08:30 AM   #29
Salas is offline Salas  Greece
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Investigating step by step, is the only way to assess and keep solutions in perspective for our DIY arsenal. Thanks for the info.
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Old 25th December 2009, 08:26 AM   #30
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Is there a benefit to go with higher than 4700 uF caps when using Salas shunt to power dacs +- 5V -15V or output dac stages like Pass B1, D1
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