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Here is a link to the SCR circuit that I am using. It's inline before the rectifier.
**broken link removed**
If there's a better, smoother way to get variable voltage, please let me know. I'm trying to combine two old projects into one. I want to remove the need for a variac and replace it...
I've built a variable voltage DC power supply circuit using an SCR, rectifier and 160v 33uF capacitor. I've got a 7-150v DC voltmeter hooked up to display the voltage. It always reads 160v, even if I use my multimeter. If I remove the capacitor, I get true voltage readings. How big of a load...
OK. NO AC current in the caps. Got it. However, I have no clue about the equations on the link. Would a 5w resistor work for a load, or should I just plug in a light bulb?
I have 1280uf 200v capacitor in a circuit. The input is variable between 1vdc and 108vdc, 1vac and 120vac. Amperage is less than 1A. When I turn the variable transformer down, it takes a long time to drop the voltage. I have a 100w 100ohm resistor that drains the power. It is currently on a...
Nope, not working right. I think the problem is the input selection. From my old project plans, I have determined that INLO would connect to the positive signal to be measured passing through to 10k resistor
AND ground. I don't have a ground in this unit, so can I connect it to the negative...
Thank you, I just remembered the manufacturer. Lascar Electronics. I googled them and the logo matches!
10m and 10k resistors, got it. Sounds right, so I will get some and test it tomorrow. Thank you.
A few years ago, I made an ATX power supply tester that displayed the voltage on each of the five lines in a computer power supply. It's been at least 6 years and I can't remember the manufacturer or how to wire this display for 200v.
According to the original plans, I have a 10k and 1ohm...
So, hooked in parallel is the proper installation. I'll try it and see how long it takes to drain the caps using theresistor.
Added after 2 hours 12 minutes:
Well, nothing blew up! Nothing turned red-hot! Nothing even got warm!
I installed a switch for the resistor and the voltage...
Convert the output from the bus to 12v and change nothing on the beetle.
Are you sure the rear connector and lights are 24vdc? I couldn't imagine a trailer connector being anything other than the standard 12vdc. Have you checked with a multimeter? I can see the inside of the bus running...
Open a Laptop
You don't need to open it to clean it out. Using a toothpick and an air compressor is the way most professionals do it. With the laptop powered off, GENTLY stick a toothpick into the fan to prevent it from spinning. Failure to do so could burn-out the bearings or even cause the...
Let me be more specific. Yes, I know the two 680uf caps are in parallel. I have them in parallel with a set of leads coming out. Do I hook those leads in parallel to the outputs of the rectifier? I just don't want this to blow up on me so I want to be certain before I do it.
Mind you...
In order to smooth the voltage coming out of this, it is recommended to use a capacitor 200v 1000uf or larger. I have two 200v 680uf. My ability to read schematics is limited, but it seems that the capacitors are in parallel to the circuit. Shouldn't they be in series? Also, does the...
OK, getting too complicated that route. Maybe I could just use a transformer hooked to the 120VAC to get the signal.
I started building and testing it today. I get a nice .5vdc - 108.1vdc after the rectifier.
Here's where I am afraid I am going to blow something up. According to the...
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