Search found 608 matches

by Joseph
Fri Sep 20, 2019 7:26 pm
Forum: General Discussion
Topic: Voltage spike
Replies: 9
Views: 319

Re: Voltage spike

You're welcome. If what you try doesn't work, the problem seems pretty possible to solve one way or another.
by Joseph
Fri Sep 20, 2019 1:29 pm
Forum: General Discussion
Topic: Voltage spike
Replies: 9
Views: 319

Re: Voltage spike

That seems more like a problem I worked on afterall. I had a big transformer that I was doing PWM of the 115VAC 60hz to the primary winding. When primary power was turned off a big spike would happen. i solved it by shorting across the primary when the power was disconnected. A difference I see is h...
by Joseph
Thu Sep 19, 2019 11:48 pm
Forum: General Discussion
Topic: Voltage spike
Replies: 9
Views: 319

Re: Voltage spike

If I get the idea of your circuit, a possibility could be to build a snubber circuit that gets switched across the transformer output when the circuit being powered is switched off. It could involve a big capacitor to store the energy that gradually gets dissipated by a resistor.
by Joseph
Sun Aug 11, 2019 11:50 am
Forum: General Discussion
Topic: I can't think today.. help !
Replies: 10
Views: 2896

Re: I can't think today.. help !

I think that type of way is good
by Joseph
Tue Jul 09, 2019 8:26 pm
Forum: General Discussion
Topic: The honorable relay vs technology
Replies: 8
Views: 2053

Re: The honorable relay vs technology

I control the compressor of my window A/C externally to get better results than stock performance. But I have to attend to it or the evaporator will ice up. Once I fell asleep and the ice on the evaporator got thick and stopped the fan. It was straining and overheating when I woke up.
by Joseph
Wed Jul 03, 2019 7:44 am
Forum: General Discussion
Topic: The honorable relay vs technology
Replies: 8
Views: 2053

Re: The honorable relay vs technology

Oh that was a bummer how only cycling the power to the unit couldn't turn it on and off. I'm glad the ones I have can be turned on/off remotely by means of the AC going to the power cord.
by Joseph
Thu Jun 20, 2019 10:37 am
Forum: General Discussion
Topic: I found a doohicky thingie
Replies: 6
Views: 1878

Re: I found a doohicky thingie

Would there be a transmitter too .. I had some garden watering timers for drip irrigation that I tried to repurpose but forget at the moment what I tried to do.
by Joseph
Thu Jun 20, 2019 10:28 am
Forum: General Discussion
Topic: magnetic amplifier battery charger circuit or...
Replies: 4
Views: 2351

Re: magnetic amplifier battery charger circuit or...

I'm leaning back toward an idea I had earlier, maybe as more an experiment than anything. I got a variac that I couldn't use inside my place here because it had a strange defect of outgassing something very toxic feeling. But I could set it under the car hood for charging. Well, I'm thinking of open...
by Joseph
Wed Jun 19, 2019 10:09 pm
Forum: General Discussion
Topic: Crazy Phone issues here..
Replies: 16
Views: 3442

Re: Crazy Phone issues here..

When I and my brothers and sister were kids we found some dumped wire. It was strange because the conductors seemingly were stranded steel. Maybe one conductor out of eight was nickel or something. That was about 50yr ago.
by Joseph
Tue Jun 18, 2019 5:01 pm
Forum: General Discussion
Topic: magnetic amplifier battery charger circuit or...
Replies: 4
Views: 2351

Re: magnetic amplifier battery charger circuit

Regulators use amplifier circuits. I moved away from using the magnetic amplifier approach after checking into it and finding out that dynamic range is limited, especially tending to lack ability to have an idle output. The type of regulator makes a difference for providing qualities like stable out...
by Joseph
Sat Jun 15, 2019 12:54 pm
Forum: General Discussion
Topic: magnetic amplifier battery charger circuit or...
Replies: 4
Views: 2351

Re: mag amp battery charger circuit

The way the design is so far, it has two transformers using half wave rectification, out of phase, to supply full wave charging voltage. It's more like a quasi magnetic amplifier. However, I'm also now leaning toward not really having it be a magnetic amplifier circuit but using a transformer with a...
by Joseph
Sun Jun 09, 2019 1:40 am
Forum: General Discussion
Topic: magnetic amplifier battery charger circuit or...
Replies: 4
Views: 2351

magnetic amplifier battery charger circuit or...

I'm thinking of making a magnetic amplifier based battery charger. I have various 60Hz transformers that might be incorporated into it. I had ordered some pre-made chargers from China, but they never came, which I blame on the trade war.
by Joseph
Sun Apr 21, 2019 8:13 am
Forum: General Discussion
Topic: ok,, New Project time,,,
Replies: 31
Views: 6266

Re: ok,, New Project time,,,

I think I'd use a manual lookup table by reading a voltmeter and then seeing the corresponding figure on a chart. I pretty much did that when I used to measure outdoor temperature before digital thermometers became lower cost.
by Joseph
Fri Apr 19, 2019 5:18 am
Forum: General Discussion
Topic: Soldering iron tip woes
Replies: 11
Views: 2405

Re: Soldering iron tip woes

I used to have a low power iron that I would slip into a layered foil sleeve to make it hot. That gave me the idea the of opposite of clipping a temperature controlled one onto a heatsink that can dissipate more than the maximum output of the heater.
by Joseph
Thu Apr 18, 2019 10:29 am
Forum: General Discussion
Topic: Having a problem with a triac
Replies: 10
Views: 2188

Re: Having a problem with a triac

That's similar to what I put in a circuit when repairing an antique SCR based vehicle battery charger.