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Old 20th April 2012, 07:42 PM   #171
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Layout related the schematic above. Output BJT are mounted under PCB but not sandwiched by screew between PCB and heatsink
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File Type: jpg TSSA_BIGBT_HP_50vdc_V62_brd.jpg (268.0 KB, 566 views)
File Type: jpg TSSA_BIGBT_HP_50vdc_V62_brd_compo.jpg (231.4 KB, 533 views)
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Last edited by Idefixes; 20th April 2012 at 07:48 PM.
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Old 20th April 2012, 08:15 PM   #172
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Quote:
Originally Posted by Lazy Cat View Post
- TLP627 input now accepts 12 V remote signal (serial resistor added)
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)
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Old 21st April 2012, 12:31 AM   #173
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Quote:
Originally Posted by Idefixes View Post
Layout related the schematic above. Output BJT are mounted under PCB but not sandwiched by screew between PCB and heatsink
Just came home from the party Marc PCB looks great, will do check-up tomorrow, regards Andrej.
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Old 21st April 2012, 06:09 AM   #174
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Hi Andrej,

Some more minor cosmetical changes to improve visual symetrie :
-position of tlp627 power supply resistor (to use with 12v)
-position of 10k at signal in.
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File Type: jpg TSSA_BIGBT_HP_50vdc_V62_brd.jpg (265.6 KB, 460 views)
File Type: jpg TSSA_BIGBT_HP_50vdc_V62_brd_compo.jpg (228.8 KB, 380 views)
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Old 21st April 2012, 10:48 AM   #175
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First of all I really have to express my compliments to you for all your work at TSSA BIGBT HP PCB, the board is amazing according to my standards. Look, for only one layer PCB, drawn from medium complex schematic, there's only five wire jumpers, that's is a remarkable achievement. Hats off to you Marc.

I checked schematic separately and here we go:
- Q7 BF245B, B marking is missing
- C11, C12, C13, C14, C15, C16 are now 100 V marking, if someone will connect optional front-end power supply, that is normally +/- 5-10 V higher than the output power rails. According to given voltages table, front-end rails would be in a response +/- 35-85V. So 100 V capacitor potential marking is on a safe side in all circumstances
- erase GND symbol near C6
- connector J4-1, J4-2 is unnecessary, if there is no need to have remote on/off, than TLP is simply omitted and its pins 3 and 4 are connected with wire jumper

PCB check-up:
- R33, R34 rotate 90 and reposition as now, unisolated part pin too close to PCB edge (elcos can be at the edge - isolated body)
- omit connector J4
- position TLP, R35, LED7 as on pic
- C13, C16 are 100 V, now same diameter as C40, C44
- C12, C15 repositioned
- R23, R24 fliped horizontally
- MUR460 moved away from MJL-s, reposition them as now
- J9, J8 GND connectors moved to middle GND, as now better prevents GND interference currents

We are a tiny dot away from final PCB. Today I will check connections-tracks according to the sch.

Best regards, Andrej
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Old 21st April 2012, 01:12 PM   #176
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Quote:
Originally Posted by Joachim Gerhard View Post
I build the super simple version of post one. It worked right away.
(...)
The sound is a bit lighter then with my power buffer ( see MPP ). By adjusting the gain in the preamp and using a warmer sounding cable i got it going. I have to listen more but the amp is very transparent.
Hi Joachim,
I'm considering this as headphone amp. Can you link the final circuit of your MPP (i found the thread but it's huge)?
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Old 21st April 2012, 01:16 PM   #177
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I build it like post 1 on this tread. What i added is a cap multiplyer in the PSU plus an input RC filter with 220 Ohm in series and 150pF to ground.
I will publish that circuit here soon. For a headphone amp this is a bit overdimensioned so be carefull with the volume.
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Old 21st April 2012, 01:19 PM   #178
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Here it is.
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Old 21st April 2012, 01:25 PM   #179
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Originally Posted by Joachim Gerhard View Post
For a headphone amp this is a bit overdimensioned so be carefull with the volume.
Yeah, I plan to run lower voltage rails like 12-15V. Have to simulate distortion first.
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Old 21st April 2012, 01:42 PM   #180
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Tell me when you got it working. It sounds very good and worked right away. No problem with offset and bias. It runs quite high on cass a though, cool it well.
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