[lacro]

Prepped this little aluminium box on my kitchen table using a drill, handsaw and some sand paper. 
Now just waiting for the boards and off we go!

Have a link to the chassis you used?

[vilding]

Have a link to the chassis you used?

Sure! From a European vendor but I'm pretty sure you could find it in the US pretty easily. I know Hammond and few others make similar boxes. And it's dirt cheap (But takes a little bit of work)! Also comes in black. What I really like about it is that there are no seems/gaps, just smooth. And you just mount everything on the lid making it your bottom plate.

https://www.elfa.se/sv/metallskap-275x175x65-5mm-aluminiumlegering-aluminium-rnd-components-rnd-455-00702/p/30096020

[vilding]

If you cut a small slot between the binding posts + and - for each channel you'll get better sound.

Done, good sir!

[mresseguie]

Question for any and all chip amp owners/builders:

What might be responsible for a humming sound coming out of one of these amps? It hums without a preamp connected. It hums with a preamp connected. It doesn't hum when it's off. [Obviously.]

I'm trying to help someone trouble shoot their chip amp.

Thank you in advance.

Michael

[navi]

Question for any and all chip amp owners/builders:

What might be responsible for a humming sound coming out of one of these amps? It hums without a preamp connected. It hums with a preamp connected. It doesn't hum when it's off. [Obviously.]

I'm trying to help someone trouble shoot their chip amp.

Thank you in advance.

Michael


I had this issue with a chip amp once- someone told me to put a Zobel network between amp and speakers

[Folsom]

Michael, you didn't have that ever did you?

[mresseguie]

Michael, you didn't have that ever did you?

Well, I don't recall that I had that issue with mine. I used it in February with my Schiit Lyr3 and full range single driver speakers. It wasn't a good match because the speakers sounded a bit bright, but I don't recall a hum. [That may have been because of the Lyr3 though.]

I'm just trying to help the guy who bought mine, so I figured putting the question to other owners might prove helpful. I hope you don't mind - I'm not trying to stir up a hornets nest.

[uncola]

mine has a hum from the transformer inside physically vibrating.. mine uses the hammond EI from the BOM.  but you can only hear it from close up with the music off.. I remember a lot of people using this transformer mentioned it.. it's within specs imo

[Folsom]

I think Michael's is using a toroid, which may be less hum prone. I'd like to try to help solve the problem.

[mresseguie]

The fellow who bought mine repositioned his amp onto a different rack. This apparently reduced the hum considerably. He hasn't texted me today, so it is possible the issue is fixed.

Jeremy,

I'm pretty certain the transformer is not toroidal, but I can no longer peer into it to be sure.

[Folsom]

Well I'm always open to help - as long he knows that everything is ok for now.

[vilding]

Aaaarrrghhh! How do I connect it to just turn on when pushed in, turn off when released..? Lights are separate 12v.

[AKLegal]

Aaaarrrghhh! How do I connect it to just turn on when pushed in, turn off when released..? Lights are separate 12v.

I'm pretty sure you can just use GND and either NC or NO to operate the switch. 

[vilding]

Yeah.. I just don't get in which order... Shouldn't the 12v go gnd to 5, 12v+ to 4? Then the L goes to common (nr2), and out from...
Don't the get the wiring diagram.

[ostvald]

Hi guys,

I'm thinking of building the amp with SMPS..
Doesn't it really ruins the sound much?..

I was looking at this one: WX-DC2416 - will it fit?

Thanks!

[lacro]

Yeah.. I just don't get in which order... Shouldn't the 12v go gnd to 5, 12v+ to 4? Then the L goes to common (nr2), and out from...
Don't the get the wiring diagram.

It is a little confusing with led in the switch. Here's how I think I did it with the same switch:
Send + from PS to 3 (com), Connect 3 and 4 together and send to + power input on amp, Connect the - from the PS to a wire from 5 and send to the - side of the amp power input. Beware the led is 12v only! If you are powering with 21V from PS you will need a resistor to reduce the voltage to 12v or it will burn out the LED.

[vilding]

Hi guys,

I'm thinking of building the amp with SMPS..
Doesn't it really ruins the sound much?..

I was looking at this one: WX-DC2416 - will it fit?

Thanks!

I went with this one. Hoping it'll turn out well. Seems well enough built and the specs are good.

[vilding]

It is a little confusing with led in the switch. Here's how I think I did it with the same switch:
Send + from PS to 3 (com), Connect 3 and 4 together and send to + power input on amp, Connect the - from the PS to a wire from 5 and send to the - side of the amp power input. Beware the led is 12v only! If you are powering with 21V from PS you will need a resistor to reduce the voltage to 12v or it will burn out the LED.

Thanks man! The thing is I have a separate 12v out from the smps. And when you say Com (3), you mean 2? I'm thinking I can just take the 12v out from the ps straight to gnd (5) and 12v+ (4), connect + from ps (or wall?) to Com (3). And from there..?

[vilding]

Is it just:  PS 12v+ -> 4, PS gnd -> 5 for led.

For switch: Live (+)to 2, 2 to 3, 1 to smps +in. N to smps n in, gnd to star ground from wall socket and smps.

[lacro]

Is it just:  PS 12v+ -> 4, PS gnd -> 5 for led.

For switch: Live (+)to 2, 2 to 3, 1 to smps +in. N to smps n in, gnd to star ground from wall socket and smps.

My head is spinning! You are using this labeled 12v (per diagram) switch with 120v mains power. The + switch action is from 2 to 3. 3 when energized with button push 120v power is sent to the smps +. Mains N is direct to PS N in. 1 (NC) on switch is not used. 12v output from smps + goes to 4.  - goes to 5. No other connections needed. I think I have this correct this time.