What Are You Building Today

[Michelag]

Let's see if I'm gonna have a happy birthday...

[Pars]

There's an awful lot of solder on your SMD parts.

[Michelag]

6 hours ago, Pars said:

There's an awful lot of solder on your SMD parts.

I'm still getting better at it

[G600]

Think of it as a layer of glue, not as a solder dome like with through hole.

And don't worry, electrons will flow!

[Omega_ELS]

On 10/11/2025 at 8:34 PM, Michelag said:

 

Hello
Are these converters quiet?
thanks for reply

Is there a difference between

the USA24400S-8 or the USA12400S-8?
They differ only in the input voltage.

Do they create a buzzing sound in the headphones, as is usually the case with cheap DC-DC converters?
Can they be used to power an amplifier with +-400V?
My HVRV power supply just broke. I'm thinking of installing two of these USA12400S-8.

thanks for reply or any information.

 

 

By the way, here's the HVRV board.
I think he was inspired by Kevin's amplifier idea—the photo shows the same 20 transistors, 4 capacitors, and resistors.

[Michelag]

On 11/15/2025 at 10:17 AM, Omega_ELS said:

Hello
Are these converters quiet?
thanks for reply

Is there a difference between

the USA24400S-8 or the USA12400S-8?
They differ only in the input voltage.

Do they create a buzzing sound in the headphones, as is usually the case with cheap DC-DC converters?
Can they be used to power an amplifier with +-400V?
My HVRV power supply just broke. I'm thinking of installing two of these USA12400S-8.

thanks for reply or any information.

 

 

By the way, here's the HVRV board.
I think he was inspired by Kevin's amplifier idea—the photo shows the same 20 transistors, 4 capacitors, and resistors.

Yes, they're quiet to my ears. No noticeable noise in the cans. In the main thread, Dr. measured "ringing" at I don't know how many MHz. If you can find them, go for them. The supplier that I bought from, has them out of stock now.

And yes, the difference is the input voltage.

On 10/13/2025 at 8:49 PM, G600 said:

Think of it as a layer of glue, not as a solder dome like with through hole.

And don't worry, electrons will flow!

Yes, thanks, I'll see some video on YouTube and I'll become a pro! 😁

[luvdunhill]

A boat battery box of sorts. Allows me to connect my Garmin EchoMap, charge my phone and start my Yamaha motor push to start outboard. Waiting for some insulated terminal  knob battery connectors to arrive  before give it a go next week..