Yep, the inverting input voltage was driven via feedback to mirror the
voltage on the non inverting input voltage divider.
Just an odd place to pick off a reference voltage. It was just a bit lower
than the output but it is very stable.
-----Original Message-----
From: Mark Radabaugh
Sent: Saturday, December 15, 2018 12:31 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] OT Linear Circuit
Ever figure out how that op amp circuit worked?
Mark
On Dec 14, 2018, at 6:35 PM, <[email protected]> <[email protected]> wrote:
So, I reverse engineered the controller, found a main feed cap that didn't
have enough capacitance to power the controller, replaced that, then found
the op amp was goofy, replaced that (it was actually in a socket).
Installed everything, hot water. Very happy. In the process while wiring
up the triacs to the heating elements, got in a hurry and did it without
powering it down.
First time in my life that I blew a circuit breaker from the current that
went through my hand! I presume the circuit breaker is more sensitive to
currents to ground but I am pretty sure my hand did not conduct 20 amps.
-----Original Message----- From: Seth Mattinen
Sent: Tuesday, December 4, 2018 9:09 PM
To: [email protected]
Subject: Re: [AFMUG] OT Linear Circuit
On 12/4/18 8:03 PM, [email protected] wrote:
It is 18 kW. Two runs of some pretty large wire. Maybe #8.
Perhaps a pair of 40 amp circuits I think.
Yeah that's like 80 amps at 240V. 8 AWG would be correct for 40 amp
circuits.
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