Changed the regulators and mosfets. Changed power supply resistors R20 and R37. At opamp, measured close to 14.8 on both supplies. With old opamp, left channel seemed ok. Right channel was distorted. Changed to opa2134. No sound on right. Left sounds good.
Offsets are about 13mv on both channels now.
Thanks for any suggestions.
Supply voltages are ok. So I skipped the power part.
I checked every resistor via DMM. No shorts: Left and right side values match. Visually, caps look ok. As far as I can tell, connections are ok from input to output.
Is there a way to test 4n35 or should I just change the one for the right ? Earlier, with the wrong heatsinks, Q3 had goo on top.
Any other ideas? Thanks.
Thank you.
R16,R22 had 1.1V
R29,R32 had 0
I'll order one of these.
Additionally, Without inputs and outputs,
Supplies ~ 14.8V
Voltages at opamp pins:
7 -330 mV
6 14 mV
5 13.9 mV
1 13.95 V !
2 13.9 mV
3 13 mV
They both had 0V across them. From one to the other was 14.8V (both terminals away from the mosfets).
The left channel ones (R11,R19) also had 0V across them. However, from one to the other was 11V.
Thanks
Hello,
I have recently soldered up the Whammy. What a fun project until now.
I have finished everything and now experiencing a lot of hum and noise when turning up the volume knob.
Is there somewhere I should look at?
I have the LM833N op amp.
Any help is greatly appreciated as I am a novice at this.
[/url]Untitled by tam.rmc, on Flickr[/IMG]
[/url]Untitled by tam.rmc, on Flickr[/IMG]
[/url]Untitled by tam.rmc, on Flickr[/IMG]
[/url]Untitled by tam.rmc, on Flickr[/IMG]
I have recently soldered up the Whammy. What a fun project until now.
I have finished everything and now experiencing a lot of hum and noise when turning up the volume knob.
Is there somewhere I should look at?
I have the LM833N op amp.
Any help is greatly appreciated as I am a novice at this.
Thank you sir. I will give it a try.
When the potentiometer is at the lowest setting, it is dead silent. When knob is moved, the noise comes in.
Hello lostthumb,
Your regulator configuration does not look like the ones given in "WHAMMY" Pass DIY headphone amp guide
Configuration 1 - “Naked Regulators”
Configuration 2 - “LED reference”
Configuration 3 - “Resistor reference”
It seems to me that you used a mix of them. Which option did you use?
Your regulator configuration does not look like the ones given in "WHAMMY" Pass DIY headphone amp guide
Configuration 1 - “Naked Regulators”
Configuration 2 - “LED reference”
Configuration 3 - “Resistor reference”
It seems to me that you used a mix of them. Which option did you use?
Lol, thank you. I apparently did configurations 1 and 2.
I guess after testing the power part, I started to populate everything else.
I will try to find some time today to remove r9,10,13, and 14