★★ Free PCB for JLH 2005 Class-A Amplifier - Page 5

AudioSan · 1st February 2012, 10:44 PM

Quote:

Originally Posted by siliconray

Has any body already finished the assembly? I'm looking forward to see your testing results and reviews..

I have finished the assembly to night. just waiting for me PSU caps and transformer. but i soldered inn C3, and have only VR1 200ohm.
so how much effekt will that do? and VR1 is DC ofset? VR2 bias?
but what about VR3?

siliconray · 1st February 2012, 10:48 PM

I audio, the effect is significant. you can't get the zero output with 200Ohm vr1 with C3 installed. remove C3 if you can't find a 2k ohm

AudioSan · 1st February 2012, 11:26 PM

Quote:

Originally Posted by siliconray

I audio, the effect is significant. you can't get the zero output with 200Ohm vr1 with C3 installed. remove C3 if you can't find a 2k ohm

done. and then jumper it, right?

apjaudio · 11th February 2012, 11:10 AM

Boards have arrived today, just about to see what bits I need to order and start building

siliconray · 14th February 2012, 01:20 PM

bump...want to see some result and suggestions to improve the suggestion.

AudioSan · 14th February 2012, 03:25 PM

Quote:

Originally Posted by siliconray

bump...want to see some result and suggestions to improve the suggestion.

one improment must be the solder eyes. it is very smal space for the solder to atatch on the back side of the boards. it vil work with a very thin solder iron. i hadd to solder resistors from the top.

siliconray · 15th February 2012, 12:18 AM

Hi AudioSan

Could you explain a little more about your problem? We have no problem in assembly the boards from the back side. If you can solder from the top side, why can't solder from the bottom?

AudioSan · 15th February 2012, 01:55 AM

the soldering area around the holes was to smal for my iron. transistors was fine. but resistors was a pain. but it worked out

maybe get a thiner iron tip.

siliconray · 21st February 2012, 05:08 AM

If you are looking for a nice enclosure for this amplifier here it is:

RE2209 Aluminum Enclosure for Audio Amplifier

AudioSan · 21st February 2012, 12:33 PM

Quote:

Originally Posted by siliconray

If you are looking for a nice enclosure for this amplifier here it is:

RE2209 Aluminum Enclosure for Audio Amplifier

i am looking for a enclosure for JLH headphone amp. i was thinking of RE229.
but i don't need the heatsink. is it possible to buy it without the heatsink?
it is the only enclosure that have the depht i need.

1st February 2012, 10:48 PM	#42
siliconray diyAudio Member Join Date: Sep 2011	I audio, the effect is significant. you can't get the zero output with 200Ohm vr1 with C3 installed. remove C3 if you can't find a 2k ohm __________________ www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me

14th February 2012, 01:20 PM	#45
siliconray diyAudio Member Join Date: Sep 2011	bump...want to see some result and suggestions to improve the suggestion. __________________ www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me

15th February 2012, 12:18 AM	#47
siliconray diyAudio Member Join Date: Sep 2011	Hi AudioSan Could you explain a little more about your problem? We have no problem in assembly the boards from the back side. If you can solder from the top side, why can't solder from the bottom? __________________ www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me

15th February 2012, 01:55 AM	#48
AudioSan diyAudio Member Join Date: Feb 2009	the soldering area around the holes was to smal for my iron. transistors was fine. but resistors was a pain. but it worked out maybe get a thiner iron tip. __________________ soon to be: papa's Class A all the way

21st February 2012, 05:08 AM	#49
siliconray diyAudio Member Join Date: Sep 2011	If you are looking for a nice enclosure for this amplifier here it is: RE2209 Aluminum Enclosure for Audio Amplifier __________________ www.siliconray.com High Quality Audio Enclosures, Amp Kits, Amplifiers, PCB Fab Services Chat with me


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11th February 2012, 11:10 AM	#44
apjaudio diyAudio Member Join Date: Jan 2012	Boards have arrived today, just about to see what bits I need to order and start building

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