"WHAMMY" Pass DIY headphone amp guide

[batty]

Thanks

 

[Oracle1]

Please HELP. i test the psu and +rail ok (+16,86) but in minus i have -26,4v. I changed the 7915 and the cap 220uf but the same -26,35. What shal i do?

 

[6L6]

Seems the regulator isn’t working. Please post a couple well-lit, in-focus photos of the regulators and associated components.

 

[batty]

Could the -ve reg be in the wrong way around?

 

[batty]

Last parts for mine are expected today, less the case.

 

[Oracle1]

I have changed ALL items of the psu even the transformer. The same! So i give up. No more Whammy for me. Pitty

 

[wayne]

You need to get an Ohm meter out and find the short on the board.

 

[Oracle1]

Finally i put R9,10,13 and R14 and i have +21,21 and -21,23. I omitt leds. Hurray!!!! I dont anderstand , maybe the leds? I’ve chacked everything nothing was short on the board. I am very happy and i thing it is time to continue the assebly. The black pcb is very beautyfull!

 

[HiGHFLYiN9s]

Finally i put R9,10,13 and R14 and i have +21,21 and -21,23. I omitt leds. Hurray!!!! I dont anderstand , maybe the leds? I’ve chacked everything nothing was short on the board. I am very happy and i thing it is time to continue the assebly. The black pcb is very beautyfull!

Glad you were able to work things out!

 

[batty]

I used Green LEDs at 2.1v, supplies are sitting at approx +/- 18.
I will complete the PCB this weekend then wait for the case I ordered to turn up.

 

[Mobes123]

Built my whammy a few weeks ago and I'm really enjoying it. I've added an ODAC into the case and have been streaming from Tidal. Basically, I'm very happy with my first DIYAudio project

I'm thinking of adding a second headphone jack to allow two listeners. Does anyone have any thoughts on this? I'm planning to use HD6XX and Grading SR325e together. Anything I need to consider?

 

[Mobes123]

sorry typo I meant Grado SR325e

 

[mercedese63]

Happy Labor Day to everyone here in the U.S..

Is there any advantage/disadvantage to using Schottky 1A diodes in place of the 1N4004 diodes as rectifiers?
I have quite a few of them is why I'm asking.

Thanks.

 

[6L6]

Go ahead, it should work well!

 

[Zen Mod]

better sleep , if nothing else

 

[HiGHFLYiN9s]

Happy Labor Day to everyone here in the U.S..

Is there any advantage/disadvantage to using Schottky 1A diodes in place of the 1N4004 diodes as rectifiers?
I have quite a few of them is why I'm asking.

Thanks.

I used UF (ultra fast) ones. Doubt I could hear a difference but they're only a few cents more

 

[kpsthakur]

Finally i put R9,10,13 and R14 and i have +21,21 and -21,23. I omitt leds. Hurray!!!! I dont anderstand , maybe the leds? I’ve chacked everything nothing was short on the board. I am very happy and i thing it is time to continue the assebly. The black pcb is very beautyfull!

Yes, it was the LED that created this challenge, the circuit will function well without them as well...nJoy

 

[batty]

Is it OK to take the o/p from the headphone socket internally to RCA out on the rear panel? I have a larger case that will accomodate them. Or is there a better way to get output via RCA.

 

[PC997]

I like to buy a second PCB for this. I really like the green boards. Anyone has a green board available?

Thanks

 

[kevinr]

Optocoupler

I am returning to this project ( after a really long layoff and just have a few caps and heat sinks to order from Mouser in order to complete the WHAMMY .
Rev. 3 PCB / config. 1 .... I already have the 15V PS

In checking over my mostly stuffed PCB I see that I installed the 4N35 Optocouplers with the lettering in the same direction as the PCB lettering; but the dot on the OC isn't facing the notch.

Thanks for the excellent illustrated guide , it is definitely helpful !