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Search: Posts Made By: redwire
Forum: General Electronics Technical Discussion Yesterday, 10:31 PM
Replies: 7
Views: 50
Posted By redwire
Re: Car USB power module 5V 8A

I've tested it at 8A. My rule of thumb - rated chinese watts/amps, best to cut in half...

The power components - the two AOD4184 MOSFETS are rated 40A, and the inductor Sumida CDEP-147NP-9R5MS...
Forum: Equipment Usage, Soldering, Techniques, and Reviews Yesterday, 10:27 PM
Replies: 15
Views: 194
Posted By redwire
Re: KSGER Battery BMS charge battery board review

What store did you buy the duds from?
T12 clone tips are more than $2 from Quicko or KSGER store.
Forum: General Electronics Technical Discussion Yesterday, 04:31 PM
Replies: 7
Views: 50
Posted By redwire
Re: Car USB power module 5V 8A

At 8A output it heats up, dissipates around 3.5W the inductor gets hot.
They say use use a cooling fan if you want 8A all the time. It's really good for ~5A with no problem and efficiency stays over...
Forum: Equipment Usage, Soldering, Techniques, and Reviews Yesterday, 12:50 PM
Replies: 15
Views: 194
Posted By redwire
Re: KSGER Battery BMS charge battery board review

It sounds like a bad connection inside the tip/heater that goes away once it is hot. Like a dud (contaminated) spotweld/crimp inside.

T12 "ERROR" is when the thermocouple amp sees a fake silly...
Forum: General Electronics Technical Discussion Yesterday, 02:51 AM
Replies: 7
Views: 50
Posted By redwire
Car USB power module 5V 8A

How do I mount this stupid thing? :why: It has a 2mm hole and a couple 1mm holes close to traces. M2 fits but no way I can drill that precise in a car.

Upgrading my car USB power and can't stuff...
Forum: General Electronics Technical Discussion 06-18-2019, 11:40 PM
Replies: 6
Views: 91
Posted By redwire
Re: Automotive fuel gauge and sending unit issue

I've done car fuel gauge control for propane and natural gas conversions.
I use a microcontroller to read tank pressure, convert and drive the car's original (gasoline) gauge.

Covering 80 years...
Forum: General Electronics Technical Discussion 06-17-2019, 02:05 PM
Replies: 10
Views: 128
Posted By redwire
Re: Electric mouse/rat trap power supply

The little stun gun HV modules "1000KV" or "30KV" overheat and die if run for even 30 seconds. Or they arc over inside with no gap to limit.
They are all one-transistor saturated-core DC-DC with HV...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-17-2019, 01:56 PM
Replies: 15
Views: 194
Posted By redwire
Re: KSGER Battery BMS charge battery board review

A T12 soldering station large enclosure is 130mm L x88 W x38 H for the 24V mains PSU and controller.

The 88mm aluminum extrusion is common in china and you can get longer clamshell pieces or...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-16-2019, 08:32 PM
Replies: 15
Views: 194
Posted By redwire
Re: KSGER Battery BMS charge battery board review

The BMS IC datasheet says it needs many charge/discharge cycles to fully equalize a pack that is poorly balanced. High value balancing resistors like 510R on the KSGER battery board are 7.3mA delta...
Forum: General Electronics Technical Discussion 06-16-2019, 08:22 PM
Replies: 31
Views: 3,050
Posted By redwire
Re: Blendtec smoother 13 repair.

All I could find is one part used on a few Blentec products but no mention of the Smoother 13. Blendtec brushes 10-030-03 obsolete, replaced by 10-030-04. If you know the size and shape you can get...
Forum: General Electronics Technical Discussion 06-16-2019, 01:48 PM
Replies: 19
Views: 268
Posted By redwire
Re: Dead hand drier autopsy - motor discussion

It needs a new blower motor and all that labour to try fix it- it won't make any warranty period and end up being back in the shop soon.
I liked it when other techs took over on a repair job. I...
Forum: General Electronics Technical Discussion 06-15-2019, 04:14 PM
Replies: 10
Views: 128
Posted By redwire
Re: Electric mouse/rat trap power supply

Youtube does not allow "content where there is infliction of unnecessary suffering or harm deliberately causing an animal distress" or something like that, some viewers complained about the cute pest...
Forum: General Electronics Technical Discussion 06-14-2019, 06:43 PM
Replies: 6
Views: 91
Posted By redwire
Re: Automotive fuel gauge and sending unit issue

Old GM 1930-1964 senders are 0-30 ohms; 30 ohms=Full. So the gauge wants to see Full=30 ohms, Empty=0 ohms.
New aftermarket senders are 240-33 ohms; 33 ohms Full, 240 ohms Empty.

So you need to...
Forum: General Electronics Technical Discussion 06-14-2019, 05:04 PM
Replies: 10
Views: 128
Posted By redwire
Re: Electric mouse/rat trap power supply

What throws me off is the youtubers all hiding their power supply, to keep their fame and glory, and youtube's censorship of anything mean like an arc.

The feet and tail seem to get the jolt. The...
Forum: General Electronics Technical Discussion 06-14-2019, 04:56 PM
Replies: 6
Views: 91
Posted By redwire
Re: Automotive fuel gauge and sending unit issue

It sounds like a fun project.

You would need a circuit to amplify the signal, and possibly invert it because some senders are low resistance empty, others low ohms when full. You could do it with...
Forum: General Electronics Technical Discussion 06-14-2019, 12:40 AM
Replies: 10
Views: 128
Posted By redwire
Electric mouse/rat trap power supply

Electric mouse/rat traps on youtube, and I was trying to figure out the power supply to buy one. There are loads of fake videos with 12V battery + 150uF 450V cap in parallel... the HV PSU is hidden....
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-12-2019, 03:34 PM
Replies: 13
Views: 236
Posted By redwire
Re: KSGER STM32 T12 soldering stations

That's the better one, it's still pretty good for stuff out of china, with the usual couple of weak points.
I think most important is adding a PE ground wire from the IEC outlet to the chassis.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-12-2019, 02:12 PM
Replies: 13
Views: 236
Posted By redwire
Re: KSGER STM32 T12 soldering stations

A person could grind off the fin on the heatsink for more clearance. I used Kapton tape and lifted the heatsink up a bit, it does have sharp edges which would cut solder mask.

It really does take...
Forum: General Electronics Technical Discussion 06-12-2019, 01:19 PM
Replies: 10
Views: 278
Posted By redwire
Re: Battery reverse rejuvenation

Lead acid batteries can fail due to sulphation or the plates corroding.
If the plates are shot and you give it the sulphation treatment, it will just make lots of hydrogen and waste your time.
I...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-12-2019, 01:10 PM
Replies: 13
Views: 236
Posted By redwire
Re: KSGER STM32 T12 soldering stations

Left is the lower quality one, right is the better quality one.
Before I was mentioning the right better quality one that had a few weaknesses.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-11-2019, 09:37 PM
Replies: 13
Views: 236
Posted By redwire
Re: KSGER STM32 T12 soldering stations

It's a good power supply. Just the two issues with 100V snubber cap and heatsink on the HV pcb trace, and it takes a few seconds to power up which is strange. KSGER sells it with their better...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-10-2019, 09:01 PM
Replies: 15
Views: 194
Posted By redwire
Re: KSGER Battery BMS charge battery board review

I could only find more info in chinese and run webpage through google translate for some of it. https://item.taobao.com/item.htm?id=559209639154

It's supposed to be a high performance battery...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-10-2019, 01:46 AM
Replies: 66
Views: 751
Posted By redwire
Re: DPS5020 dual power supply build

You short each winding and measure capacitance from pri-sec, pri-core, sec-core.
It's good to know how much the leakage currents might be. Some 600VA big toroids are 100's nF pri-sec.
Forum: General Electronics Technical Discussion 06-09-2019, 04:11 PM
Replies: 10
Views: 209
Posted By redwire
Re: 24 volt @ 3.3 amp switching power supply

It looks like the heater wires are crimped (or spot weld?) to the collars.
If you're sure the socket is working and the tip pushed in far enough, I guess take it apart.
I have aluminium FX9501...
Forum: General Electronics Technical Discussion 06-08-2019, 07:06 PM
Replies: 10
Views: 209
Posted By redwire
Re: 24 volt @ 3.3 amp switching power supply

What problem are you having with the T12 tip? I find it's usually the socket in the handle making a bad connection. Mine read 8R for the heater and about 2.5MEG to the tube, I think the cement has...
Showing results 1 to 25 of 500

 
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