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Old 13th April 2012, 04:42 PM   #81
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Originally Posted by Idefixes View Post
Hi, LC could adapte the TSSA HP for +/-50Vdc? It would be really nice from you.

For fun il will try the liitle pcb for TSSA TT.

Marc
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Testing/ironing out TSSA BIGBT, allowing/confirming a range of PSUS 45V-70V and issuing a board would be a happy practical conclusion of the Andrej ideas threads. What is the projected power range for those supply voltages?
TSSA BIGBT HP is high precision CCS driven-defined (1,72 mA source/sink) so all idle conditions depends on this value. Change of the supply potential would be peace of cake stuff, demands only to change the resistance value of the voltage dumping resistors (4 x 56 k, 4 x 22 k). All other parts would stay unchanged if they fulfill minimal potential margins.

So we can produce one amp covering supply DC voltages (rails) from +/- 24-75 V with two pairs of outputs. Power calculations can be done for rehearsal by anyone himself.

P.S. Values of 56 k are wrong, I made calculations with 1,172 mA instead 1,72 in a hurry. So the values will be corrected in a package when we will get few other improvements as well. This version is opened to be polished to high gloss ...

Last edited by Lazy Cat; 13th April 2012 at 04:49 PM.
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Old 13th April 2012, 04:43 PM   #82
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Thanks for explanation, the question was beacause i have a couple of 2x300va 2x25vac and 22.000/40v caps, so i will probably etch next week the pcb i posted and test with +/-25Vdc rail. I can also swap 3281/1302 TT to 4281/4302 TT to have more marge-in.

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Old 13th April 2012, 04:47 PM   #83
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Quote:
Originally Posted by Lazy Cat View Post
TSSA BIGBT HP is high precision CCS driven-defined (1,72 mA source/sink) so all idle conditions depends on this value. Change of the supply potential would be peace of cake stuff, demands only to change the resistance value of the voltage dumping resistors (4 x 56 k, 4 x 22 k). All other parts would stay unchanged if they fulfill minimal potential margins.

So we can produce one amp covering supply DC voltages (rails) from +/- 24-75 V with two pairs of outputs. Power calculations can be done for rehearsal by yourself.
That's a good news, just the LT1034 seems to be a pity to find even no stock on digikey and no to mouser.

Marc
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Old 13th April 2012, 04:54 PM   #84
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That's a good news, just the LT1034 seems to be a pity to find even no stock on digikey and no to mouser.

Marc
TL431 with REF and CATHODE pins connected together would do the job quite the same, only with a little higher noise floor and 50 ppm/C instead 20 ppm/C voltage vs. temperature drift at LT1034.

Last edited by Lazy Cat; 13th April 2012 at 05:02 PM.
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Old 13th April 2012, 07:02 PM   #85
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So we can produce one amp covering supply DC voltages (rails) from +/- 24-75 V with two pairs of outputs. Power calculations can be done for rehearsal by anyone himself.
Andrej, we don't have expertise about BIGBT or their bias here to calculate on a glance. So, confess it all. 30-150W @ 8 Ohm for that schema?
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Old 13th April 2012, 07:53 PM   #86
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Originally Posted by Lazy Cat View Post
TL431 with REF and CATHODE pins connected together would do the job quite the same, only with a little higher noise floor and 50 ppm/C instead 20 ppm/C voltage vs. temperature drift at LT1034.

That's a another good news...

A another seems me strange is the IR LED????
Marc
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Last edited by Idefixes; 13th April 2012 at 08:08 PM.
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Old 13th April 2012, 07:54 PM   #87
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Originally Posted by Salas View Post
Andrej, we don't have expertise about BIGBT or their bias here to calculate on a glance. So, confess it all. 30-150W @ 8 Ohm for that schema?
When i read that i feel me suddly less alone...

Marc
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Old 15th April 2012, 09:45 AM   #88
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First try for TSSA_BIGBT_HP single layer. 165x135mm. TLP627 is not connected out for moment
Attached Images
File Type: jpg TSSA_BIGBT_HP_sch.jpg (149.5 KB, 972 views)
File Type: jpg TSSA_BIGBT_HP_brd.jpg (191.5 KB, 946 views)
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Old 15th April 2012, 10:21 AM   #89
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Just a little precision : BJT Bigbt transistors are mounted under pcb "sandwiched" between pcb and heatsink surface by the screw.

Marc
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Old 15th April 2012, 05:32 PM   #90
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All day was rainy so i continue to play with eagle : consmetics changes and pcb reduction size was on programm
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File Type: jpg TSSA_BIGBT_HP_brd_V2.jpg (194.2 KB, 857 views)
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Last edited by Idefixes; 15th April 2012 at 05:45 PM.
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