You need potentiometer and optional two zeners to protect input of the sound card.
legs 1 and 3 to the load and leg no 2 to sound card -- thats it. To protect the sound card input just putt zeners across pin 2 and ground.
If you will have some artefacts put 10R resistor to separate signal GND from amp GND.
The BG4 was with 2 LTP's at the front of the amp (development has stopped cause lack of my knowlage to sort out clipping issues). BG5 is version with single j-fet LTP at the front of the amp. So far it looks like on schematic bellow.
I just substituted two zeners in cascode with double leds. After I will do all tests Ill post whole documentation anyway.
Regards
I just substituted two zeners in cascode with double leds. After I will do all tests Ill post whole documentation anyway.
Regards
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Small update, I have managed to stuff the enclosure with amp boards (two different versions Left and Right). Now i will have to make a listening test to make sure that all is OK.
DF was measured on finished amp after protect relay and inductor coil. I have seted the gain at x47 cause I am not going to use any preamp. After I will listen to It for a while I will post all schematics, thermo-transfer files etc.
So far it looks like bellow.
DF was measured on finished amp after protect relay and inductor coil. I have seted the gain at x47 cause I am not going to use any preamp. After I will listen to It for a while I will post all schematics, thermo-transfer files etc.
So far it looks like bellow.
Attachments
apexaudio
THX
This kind of amp is very neutral/natural in sound and I think not for all would be good.
I think your idea from the 1st post would be nice to try and finish in 100%. I remember first prototype with 4 LTP's and it was sounding stunning but I do not know how to resolve the clipping issu on sine wave above 5kHz, other than that it was super.
THX
This kind of amp is very neutral/natural in sound and I think not for all would be good.
I think your idea from the 1st post would be nice to try and finish in 100%. I remember first prototype with 4 LTP's and it was sounding stunning but I do not know how to resolve the clipping issu on sine wave above 5kHz, other than that it was super.
It was so long time ago that I do not remember, but it should help a bit, sansui was using some diode clamps at the VAS stage as far I remember. Maybe the diode clamps at the DD stage will be more helpful ??
Your desingn with 4 LTP's is very good, low Vce transistors can be used in all LTP's.
I have had MJE340/350 at the VAS stage and they are a bit slow recovering from saturation (sticking), better transistors here would help too.
Your desingn with 4 LTP's is very good, low Vce transistors can be used in all LTP's.
I have had MJE340/350 at the VAS stage and they are a bit slow recovering from saturation (sticking), better transistors here would help too.
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