Re: [CAD_CAM_EDM_DRO] I let the smoke out...

On Sunday 14 September 2003 12:06 am, Harvey White spake:

> OK, if you got the standard type of 3 terminal regulator (a la radio
> shack), it is a 7805. The 7805, unlike the chip that Mariss uses, has
> an input voltage limit of 35 volts for any regulator from 5 to 18
> volts. If you connected it to the 80 volt line, you zapped it.

Two things -

This was a Mouser part, NTE331.
I only just now found the old bag, so it would
seem I'm wrong about it being a regulator.
(I warned you guys - I'm electrically ignorant)

The circuit was laid out for me a year ago by
someone else that I trusted to do so at the time.
It may be a good design; I don't know. I'm only pointing out
the origins of it so you might better be able to tell me something.
It's got two caps, a resistor, a zenier diode, and a rectifier.
The Zenier is a NTE5151A and one of the caps is 10K(?)uF.
I know I'm being vague, but was too tired to remember
to bring the parts home with me to share the values...
I can do that tomorrow if you need them.
I've got a 2:1, 1Kva transformer giving this
thing input, with my output coming out at 81 VDC.

This isn't to do with the 5V previously discussed, only the motor power.

*AND* - it didn't blow until I plugged a motor
in, so I'm thinking I might've wired the motors wrong.
But I'd like to know why that might've blown the setup.

Thanks,

Weyland