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Old 21st April 2012, 10:26 PM   #191
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Here what about i though. In place of NTC there is a hole in PCB (round around NTC) on picture under.

Marc
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Old 21st April 2012, 10:37 PM   #192
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Quote:
Originally Posted by Idefixes View Post
Here what about i though. In place of NTC there is a hole in PCB (round around NTC) on picture under.

Marc
Yes the same idea here, nice Marc ... but please rotate them 90, so the NTC is away from the trimmer, especially now when soldering will take place on the top, and put R24 1,2 k by the trimmer.

Look to my previous post regarding 22 pF caps
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Old 21st April 2012, 11:03 PM   #193
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Ok for 22pf i will modify. Under modification for NTC and previsionnal PSU for TSSA amp (one psu board/TSSA board)

Could you give me a Mouser catalog ref for NTC please?
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File Type: jpg TSSA_BIGBT_HP_50vdc_V66_brd.jpg (67.9 KB, 436 views)
File Type: jpg PSU 88000uf.jpg (118.0 KB, 422 views)
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Last edited by Idefixes; 21st April 2012 at 11:14 PM.
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Old 21st April 2012, 11:08 PM   #194
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22pf third hole...
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Old 22nd April 2012, 07:56 AM   #195
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Quote:
Originally Posted by Idefixes View Post
That' mean that i can drive TLP627 by my speaker protection board. this use 12V relay mounted on satellite pcb board? I just have to keep sensing wire comming from amp board output (speaker out)
LC am I right?

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Old 22nd April 2012, 08:16 AM   #196
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Good morning Idefixes

Just drinking coffee and reading some interesting stuff hehe

Yes, if you have any kind of protection circuit (DC, lowZout, on-delay, fast-off, etc) you can omit output breaker relay (not even buying it ) and connect relay drive voltage (usually 12 V potential) to TLP. TLP cuts off output transistors instantly, much faster than any mechanical relay would, simply by interrupting the bias conditions of VAS cascode and consequently the output stage. This solution is well tested and proven in my amps so many times.
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Old 22nd April 2012, 08:52 AM   #197
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Developing an amp is a looong process, especially designing a PCB so we almost forget to say something about input low pass filter (R1, C1) and input DC offset here (P1, R2, C2). I see that at the input you still have some empty areas, to fill in parts needed

Input DC offset is probably unnecessary cause amp has DC gain set to 1 and those silly little mV's at the input transfered wouldn't do much harm at the output, so we can omit P1, R2, C2 (sch is from SSA).

It would certainly be wise to put R1, C1 on board, values 1 kohm/ 33 pF. Will correct sch later on.
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Old 22nd April 2012, 09:21 AM   #198
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Quote:
Originally Posted by Idefixes View Post
Under modification for NTC and previsionnal PSU for TSSA amp (one psu board/TSSA board)
Will you use 88.000 uF for one channel?

Quote:
Originally Posted by Idefixes View Post
Could you give me a Mouser catalog ref for NTC please?
EPCOS - B57164K103J - THERMISTOR, NTC

VISHAY BC COMPONENTS - NTCLE100E3103JB0 - THERMISTOR, NTC

EPCOS - B57703M103G40 - NTC Thermistor

The last one puts everything in a new perspective regarding NTC PCB installation, it can be mounted and soldered the same way as IRFs, no need for two extra pins.
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Old 22nd April 2012, 11:10 AM   #199
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Quote:
Originally Posted by Lazy Cat View Post
Developing an amp is a looong process, especially designing a PCB so we almost forget to say something about input low pass filter (R1, C1) and input DC offset here (P1, R2, C2). I see that at the input you still have some empty areas, to fill in parts needed

Input DC offset is probably unnecessary cause amp has DC gain set to 1 and those silly little mV's at the input transfered wouldn't do much harm at the output, so we can omit P1, R2, C2 (sch is from SSA).

It would certainly be wise to put R1, C1 on board, values 1 kohm/ 33 pF. Will correct sch later on.
Here we go, R1/C1 value are these from SSA schematic form moment until value is fixed. The add of latest component don't let keep the nice input area symetry we had in previous version.

Marc
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File Type: jpg L_SSA_BIGBT_HP_50Vdc_v7_sch.jpg (125.4 KB, 241 views)
File Type: jpg L_SSA_BIGBT_HP_50Vdc_v7_brd.jpg (270.3 KB, 184 views)
File Type: jpg L_SSA_BIGBT_HP_50Vdc_v7_compo_brd.jpg (233.0 KB, 95 views)
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Old 22nd April 2012, 11:13 AM   #200
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Do R3 & R36 need to be so low?
What deteriorates if 100k and 1k are adopted?

What values are C1 & C2?
2.2mF or 22mF.
I can't make out a decimal point. I prefer 2m2F instead of 2.2mF. It is unambiguous and generally recognised worldwide.
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