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Search: Posts Made By: capwizard
Forum: General Electronics Technical Discussion Yesterday, 04:36 PM
Replies: 16
Views: 92
Posted By capwizard
Re: Antique LED tester

I have one question is if I put two capacitors on both neutral and hot input lines is that means both AC lines are isolated and safe to touch?
Forum: General Electronics Technical Discussion Yesterday, 02:52 PM
Replies: 16
Views: 92
Posted By capwizard
Re: Antique LED tester

No i put one diode on it. Now I added one 474k capacitor the picture is ok now on 100ma.
Forum: General Electronics Technical Discussion Yesterday, 02:17 PM
Replies: 16
Views: 92
Posted By capwizard
Re: Antique LED tester

You said it is very correct, I just burned a lot of leds with AC, it depends on what kind of LED diodes leds used

This time I used one diode halfwave DC at 10ma, 50ma, 100ma. Pic1,2,3 Because of...
Forum: General Electronics Technical Discussion Yesterday, 01:29 PM
Replies: 16
Views: 92
Posted By capwizard
Re: Antique LED tester

African friends, I am coming. If we fail, don’t be discouraged. We believe we can fly. (https://youtu.be/GIQn8pab8Vc)

Just like what sti suggested. We hook up AC direct to variac pins2,5 we have...
Forum: General Electronics Technical Discussion Yesterday, 12:07 PM
Replies: 16
Views: 92
Posted By capwizard
Re: Antique LED tester

I have a dream..... but my dream was broken.

Everything was okay up to 150v but if I cranked up to 200-volt Transformer began to vibrate and eat up 1.2A this is a failure.:crying:

So I assumed...
Forum: General Electronics Technical Discussion Yesterday, 10:55 AM
Replies: 16
Views: 92
Posted By capwizard
Re: Antique LED tester

Thank you for your advice on safety issues.

What I'm going to do is I will put a Step-Down Transformer 120-30v reverse to step-up to 350v than diode to dc and add CC. Resolved a lot of people...
Forum: General Electronics Technical Discussion Yesterday, 10:16 AM
Replies: 16
Views: 92
Posted By capwizard
Re: Antique LED tester

I opened it.

Pic5 Can someone breaks the codes. What are the letters mean? I hope it is not stolen from school or something!

I have a question? what is that 5 and 2 pins use for in this variac?...
Forum: General Electronics Technical Discussion Yesterday, 09:33 AM
Replies: 2
Views: 36
Posted By capwizard
Beer sign

liquor store gave me this beer sign. He told me that this beer sign did not work.

I tested it was working. My question is whether there is a leak on gas or power supply? Should l open change...
Forum: General Electronics Technical Discussion Yesterday, 09:07 AM
Replies: 16
Views: 92
Posted By capwizard
Re: Antique LED tester

Thank you, my friend, but this is mainly for Africans. The simpler the easier, the better.
Forum: General Electronics Technical Discussion Yesterday, 08:58 AM
Replies: 16
Views: 92
Posted By capwizard
Antique LED tester

I have a VARIAC variable transformer, I used to test on analog TV, now TVs are changing to switching power supplies, is kind of useless so I try to modify to CC-CV LED Tester can be used on the...
Forum: General Electronics Technical Discussion Yesterday, 07:24 AM
Replies: 3
Views: 48
Posted By capwizard
Can I use the Transformer in reverse?

Can I use the Transformer in reverse to get some high voltage?

Transformer Connected Backwards
https://youtu.be/ZCNQXzOp6Io
Forum: General Electronics Technical Discussion Yesterday, 05:27 AM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

PWM (Pulse Width Modulation) "chops" a DC into many "pulsed packets" or "sections". Comparable with a turn signal circuit on the car, the consumer (eg a light bulb) does not get a "full" current, but...
Forum: General Electronics Technical Discussion 02-14-2019, 02:19 PM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

My friend has a very loud car audio system, I installed for him, the entire car would shake, was issued a ticket by the cop.

I wanted to import underbody lights to sell,10 years ago, but state...
Forum: General Electronics Technical Discussion 02-14-2019, 11:15 AM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

Thank you.

I'm gonna use TL494 to built a PWM and inject a signal into OC5011. see what will happen?

This PWM has two channels, Working frequency and period can be adjusted.

The hard part...
Forum: General Electronics Technical Discussion 02-13-2019, 07:11 PM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

I have a question!

QX9920 EN pin and OC5011 pwm pin. I know they are digital pwm , but can we use analog signal input? For example, some IC have both functions. i gonna try it.
Forum: Troubleshooting TVs and Video Sources 02-13-2019, 06:01 AM
Replies: 21
Views: 230
Posted By capwizard
Re: How do I find exact replacement LED bead for this backlight strip? and will it la

In theory, You may have a lot of shorted 6v LEDs but you only have one LED open, Yes, only one chance, one of your LEDs is open, see if you can find out which one?

TV has no backlight, I found one...
Forum: General Electronics Technical Discussion 02-12-2019, 11:30 PM
Replies: 17
Views: 2,384
Posted By capwizard
Forum: General Electronics Technical Discussion 02-12-2019, 10:44 PM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

thank you, I have seen QX9920 data but did not notice this.

luminescence and brightness are the same?

ps: in United States not allow to have lights outside or underneath the car and change the...
Forum: General Electronics Technical Discussion 02-12-2019, 09:34 PM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

OC5011 already has PWM input brightness control which sti highly recommended, We can use CMOS 555 as a simple PWM Generator to efficiently control brightness of the headlight.

H8 H9 H11 Led Car...
Forum: General Electronics Technical Discussion 02-12-2019, 08:42 PM
Replies: 17
Views: 2,384
Posted By capwizard
Re: Blendtec smoother 13 repair.

look at the picture, I connected center axis of the juicer to a hand drill then I pressed it down sandpaper with a toothbrush. You must do this to completely clean the commutator, because hand clean...
Forum: General Electronics Technical Discussion 02-12-2019, 06:27 PM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

U2 I can't see the no. But it is mosfet. (N5280?)
U1 is OC5011
Forum: General Electronics Technical Discussion 02-12-2019, 05:49 PM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

This one shows R220 is 0.22ohm. They are parallel for higher wattage.

The different car has different inside circuits construction. I have two sets.
Forum: General Electronics Technical Discussion 02-12-2019, 05:26 PM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

Red wire said...R2 R3 R4 (25ohm) are current limiters.
Forum: General Electronics Technical Discussion 02-12-2019, 04:29 PM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

That was a brilliant idea...This (Rcs) can omit the cumbersome current limit resistor. :rock: all you need are switching with SMD resistors. It costs $0.
Forum: General Electronics Technical Discussion 02-12-2019, 04:10 PM
Replies: 58
Views: 483
Posted By capwizard
Re: Car LED Headlights dimmer?

My wife laughed and said... people in Africa have more money than us and their diamonds are big than mine. :D

Nano has PWM output but can it do TPMS check out? My other idea was when the car...
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