PCB based invert 3886 chipamp assembly and comments

[Evilsizer]

looking good! wish i could find some heatsinks like that.

[digi01]

thank you Evilsizer
If there is not shipping problems,I am glad to help you to buy some.its price is reasonable.

ok,the end pic.I am still need to find some quality wires to hook up all these patterns.

[jawbreak]

Can I buy the boards already printed or anything?
Looks really good, great work!

[JimD]

digi

On the 3886 IGC is there any reason why you couldn’t use a 1k/22k or a 620R/20k (for higher gain) resistor combination instead of the 10k/220k combination you specify? Would you need to change the size of the 4.7uf input capacitor if you did use the lower value resistor combinations?

Out of curiosity what is the cost of the heatsinks, size, and what do they weight? Do you know what shipping would be to the states? I would like to get some balanced line driver and regulator boards (if still available) and could use the heatsinks if not too expensive.

Thank you
Jim

[digi01]

Hi Jim,

Originally posted by JimD
digi
On the 3886 IGC is there any reason why you couldn’t use a 1k/22k or a 620R/20k (for higher gain) resistor combination instead of the 10k/220k combination you specify? Would you need to change the size of the 4.7uf input capacitor if you did use the lower value resistor combinations?

Because the combination of the small resistors,will reduce the input impedance.then the amp input should be driven by a low impedance source such as an op amp or buffer.here is some discuss:
url, http://www.diyaudio.com/forums/showt...850#post322850

BTW,for a small resistors 3886 igc,
P-A has a wonderful design the famous industry QRP-02 gainclone.
url, http://home.swipnet.se/~w-50719/hifi/qrp02/index.html

Out of curiosity what is the cost of the heatsinks, size, and what do they weight? Do you know what shipping would be to the states? I would like to get some balanced line driver and regulator boards (if still available) and could use the heatsinks if not too expensive.

the price is $3USD per one,80x138x40(mm).the weight is 0.8kg(approx)...
YGPM

digi

[digi01]

the picture reveal another assembly way,the liner regulator is installed on a aluminium chassis.and the diodes is shifted by a international rectifier.

[digi01]

sch for this set up:http://www.diyaudio.com/forums/showt...349#post526349

[Vuamp2]

Originally posted by digi01
sch for this set up:http://www.diyaudio.com/forums/showt...349#post526349

Gigi01,

Any recommendation for people with Center tap secondry instead of dual secondary output pair Transfomr?

[digi01]

to Vuamp2,
i c,then you have to use the unregulator solution.because NSC is not offer a passive regulator chip with high current output.

edit,mistake modify.

[Aunkst]

I soldered up 2 of my four today. I built these two on the cheap to use with the computer. they sound great. no hum. I am happy.

I will keep updating as I put them into some cases.