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From: m II on 28 Jun 2010 19:04
Tim Williams wrote:

> Set up PWM values from a sine table, or use magic sinewaves (Don Lancaster's favorite).


Thanks Martin and Tim. So, if I get a 30 or 40 amp rated mosfet and
drive it with a sine wave input I will have no problems with the smoke
getting out at 10 to 20 amps output?

I'm good at cooling stuff down. I solved my rectifier bridge
overheating by suspending it in a glass of Canola oil. 6 amps and 120
volts makes it warm. It works, but sometimes drowns unsuspecting insects.

I'm surprised, actually, as the PIV rating on the bridge is only 50V
but has been working for a few months. The unit is one of those
aluminium cased Radio Shack / Source ones, with a hole in the centre.

mike

=========================================
Don Lancaster? If only he'd worked a bit harder, he could have BEEN
somebody.

Archie
=========================================
From: Tim Williams on 28 Jun 2010 19:17
"m II" <c(a)in.the.hat> wrote in message news:4c292a9e(a)news.x-privat.org...
> Thanks Martin and Tim. So, if I get a 30 or 40 amp rated mosfet and
> drive it with a sine wave input I will have no problems with the smoke
> getting out at 10 to 20 amps output?

No. I clearly stated "PWM sine". Driving a raw sine wave makes a large linear amplifier with low efficiency and big magic smoke potential.

> I'm good at cooling stuff down. I solved my rectifier bridge
> overheating by suspending it in a glass of Canola oil. 6 amps and 120
> volts makes it warm. It works, but sometimes drowns unsuspecting insects.

This gives me less confidence.

> I'm surprised, actually, as the PIV rating on the bridge is only 50V
> but has been working for a few months. The unit is one of those
> aluminium cased Radio Shack / Source ones, with a hole in the centre.

....

Hint: if this circuit
http://www.instructables.com/files/orig/FVE/I3SC/FR123O01/FVEI3SCFR123O01..png
looks good to you, you might consider hanging out on 4HV instead. Or going to highschool...

Tim

--
Deep Friar: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms
From: m II on 28 Jun 2010 21:02
Tim Williams wrote:

>> I'm good at cooling stuff down. I solved my rectifier bridge
>> overheating by suspending it in a glass of Canola oil. 6 amps and 120
>> volts makes it warm. It works, but sometimes drowns unsuspecting insects.
>
> This gives me less confidence.


Oh ye of little faith. I've already been taught by the best.

http://scotiabunk.com/



mike


From: Greegor on 28 Jun 2010 21:33
On Jun 28, 8:02 pm, m II <c...(a)in.the.hat> wrote:
> Tim Williams wrote:
> >> I'm good at cooling stuff down. I solved my rectifier bridge
> >> overheating by suspending it in a glass of Canola oil. 6 amps and 120
> >> volts makes it warm. It works, but sometimes drowns unsuspecting insects.
>
> > This gives me less confidence.
>
> Oh ye of little faith. I've already been taught by the best.
>
> http://scotiabunk.com/
>
> mike

TMI again
From: m II on 28 Jun 2010 21:43
Greegor wrote:

>> http://scotiabunk.com/



> TMI again


Merely giving credit where it's due. It's the very least I can do.




mike
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