Poor Serbian Man Optical Volume Control

[peterhenk]

Won't build so for sale

If some one is interested in a full set.

I have one that I have never came to build please PM if interested

Peter

 

[José Humberto]

Hello again.
Now, I´m ussing all transformer, 18-0-18V (realy isn´t symetrical, I purchased the chipest) The current must be higher because I have been forced to put heashinks. Sorry but I didn´t take meters. The sound is better.
I´ll don´t looking for another preamplifier for my JELabs 300B. Maybe if some day I finish the pumpink...
It will be worth test xlr input with SE amplifier? Of course, my dac have xlr output.
Best regards

 

[José Humberto]

Problem with current through jmp 01

Hello.
I turned on the pcb 01 and don´t is ok.
The measures are 17,70v PSU, The middle leg of Q3 2,33V. The red led shine ok, but the problems be the Q7 is very hot even with heatshink and open P1 and with main potentiometer in 5 o´clock the curren in jmp 01 is only 5,77mA
with jumper 01 put it the minimum current through jumper 02 is 40mA.
¿Can anybody tell me where could be the problem?
Best regards

 

[Zen Mod]

show me a picture of your pcb

 

[José Humberto]

I sent a pm with one more big pic.

 

[Zen Mod]

got it

will check it tomorrow

time for nap

 

[José Humberto]

Perfect! Sleep well.
I put it LM317T no LM317L, I twisted and exchange pin 2 and 3.

 

[José Humberto]

Sorry the LM is LM317 only.

 

[Zen Mod]

you solved problems , putting right LM317 ?

it's 1A5 , in T0220 package

 

[José Humberto]

I´m not sure if understand you ok.
I don´t put LM317 right because the datasheet is diferent of LM317L.
My LM317 is T0-220 with 1,5A

 

[Zen Mod]

pcb is made for LM317 ; I didn't wrote suffix , but it's written in table as : IC1 -LM317- 1A5 - T0220

so - no need for twisting legs !

 

[jameshillj]

Jose,
Where do you get those heatsinks with the fancy transistor clips?

 

[stoN_Cold]

Jose,
Where did you get that PCB?

Regards zeoN_Rider

 

[José Humberto]

He he. Looks nice. In Mouser
WV-T220-101E Ohmite | Mouser

If don´t run put: 588-WV-T220-101E

Are you find any mistake?

 

[José Humberto]

Ok ZM I test and tell you the result.

 

[Zen Mod]

problem is that you twisted legs of IC1 , without reason

 

[José Humberto]

Jose,
Where did you get that PCB?

Regards zeoN_Rider

Hello Zeonrider
I bought ZM some years ago.
Do you test any LDRs volume control?
Best regards

 

[José Humberto]

problem is that you twisted legs of IC1 , without reason

I saw Adj-in-out but I think is for other package.
In one old version of schematics put LM317L

 

[Zen Mod]

I would never put 317L for that current

 

[José Humberto]

I would never put 317L for that current

He he I take in my hands at this moments.