Search found 2811 matches

by haklesup
Fri Dec 20, 2019 12:30 pm
Forum: General Discussion
Topic: Cheap china led strobe lights. - need advice.
Replies: 6
Views: 2347

Re: Cheap china led strobe lights. - need advice.

"Yeah most items made in china are knockoffs." Maybe not Most but certainly a lot the cheap stuff you find on Amazon, eBay and Alibaba. The same stuff they sell in the electronics malls in china but we get the factory rejects while they keep the ones that work. Did you see the CNN story on the count...
by haklesup
Fri Dec 20, 2019 12:17 pm
Forum: General Discussion
Topic: Question about Fast adaptive charging
Replies: 19
Views: 4608

Re: Question about Fast adaptive charging

"the 2nd item on amazon is decent looking." I agree, I just ordered one for myself for Christmas. I have several older V and I only meters (we were giving them to customers at trade shows) but this one has a lot more features, sort of like the "Kill-A-Watt" but for USB devices. I found it for $1 les...
by haklesup
Thu Dec 19, 2019 10:52 am
Forum: General Discussion
Topic: Question about Fast adaptive charging
Replies: 19
Views: 4608

Re: Question about Fast adaptive charging

Here is some helpful info https://www.androidauthority.com/fast-charging-explained-889780/ https://www.androidauthority.com/usb-power-delivery-806266/ I l got corrected on a few things, I was wrong about data handshaking. I'm now wondering of all my nearly identical Samsung White Chargers, which one...
by haklesup
Tue Dec 17, 2019 1:39 pm
Forum: General Discussion
Topic: Led Driver selection help / advice
Replies: 3
Views: 1824

Re: Led Driver selection help / advice

Scanning Digikey, the vast majority of shift registers are 8bits, some in small packages, but Microchip has some interesting 64 bit chips with Voltage level shifting that you might be able to make use of. Here is one, others are in the same product family with varying bits and output max voltage I s...
by haklesup
Tue Dec 17, 2019 1:15 pm
Forum: General Discussion
Topic: Question about Fast adaptive charging
Replies: 19
Views: 4608

Re: Question about Fast adaptive charging

The Negotiation between charger and device is all Analog. A managed device can throttle the charge current to maintain safe charge temperature and prolong life according to the manufacturers firmware. The adaptive charger responds to the change in [device] charge current [limit] by adjusting the out...
by haklesup
Mon Dec 16, 2019 10:26 am
Forum: General Discussion
Topic: Led Driver selection help / advice
Replies: 3
Views: 1824

Re: Led Driver selection help / advice

The TPIC6B595 is a shift register with Open Drain outputs, Did I find the right one? Why don't you just cascade several of them to get enough outputs. Maybe you can find a CMOS output shift register with enough power to drive the LED without the open drain. A 74ACT family chip should be able to ligh...
by haklesup
Mon Dec 16, 2019 10:15 am
Forum: General Discussion
Topic: Question about Fast adaptive charging
Replies: 19
Views: 4608

Re: Question about Fast adaptive charging

We buy replacements because we lose them or need spares for travel or just different rooms. Since the Koreans don't particularly get along with the Chinese, I can't imagine an authorized Samsung product not make in Korea. They make the empty statement to use the charger that came with it because tha...
by haklesup
Thu Dec 12, 2019 2:27 pm
Forum: General Discussion
Topic: Question about Fast adaptive charging
Replies: 19
Views: 4608

Re: Question about Fast adaptive charging

I use one of those USB Voltage and Current measurement dongles. You can place it between any device and charger on the USB cable and measure actual charge current and voltage. I have been known to sample several wall warts and chose the one with the highest charge rate at any given time. One thing I...
by haklesup
Tue Dec 03, 2019 1:20 pm
Forum: General Discussion
Topic: Cheap china led strobe lights. - need advice.
Replies: 6
Views: 2347

Re: Cheap china led strobe lights. - need advice.

"No such thing as quality from China...." Even the Chinese avoid made in China for many products. The reality is that ebay and amazon have become a dumping ground for knockoffs and end of run rejects. Amazon has cleaned up a bit but ebay is still no better than Alibaba. In any case, LED for Automoti...
by haklesup
Mon Dec 02, 2019 4:11 pm
Forum: General Discussion
Topic: SPAM Attack
Replies: 6
Views: 2176

Re: SPAM Attack

Saw that, what a mess, they must have tried to run a script, must have been a whole page and a half of new spam topics
by haklesup
Mon Dec 02, 2019 4:09 pm
Forum: General Discussion
Topic: Cheap china led strobe lights. - need advice.
Replies: 6
Views: 2347

Re: Cheap china led strobe lights. - need advice.

My biggest beef with Chinese LED assemblies is they often don't bother to couple the led to the already included heat sinks. One set of tail light replacements just had the COB slotted in the aluminum heat sink but the air gap behind it made it as if there were none and they burned out quickly. Some...
by haklesup
Tue Nov 26, 2019 11:13 am
Forum: General Discussion
Topic: Transistor Nixie Clock
Replies: 5
Views: 2281

Re: Transistor Nixie Clock

OTOH, we can try to debug the circuit here but need more details of the kit. Maybe another logic family for the flip flops and some tweaks to the voltage thresholds will result in less disturbance. Just drop the kit and put the tubes and sockets on ebay as is without explanation, someone might find ...
by haklesup
Mon Nov 25, 2019 1:48 pm
Forum: General Discussion
Topic: How Do you Clean A Deep Fryer?
Replies: 14
Views: 3898

Re: How Do you Clean A Deep Fryer?

With a consumer grade replacement cost in the $50 to $80 range, they didn't build in features to make cleaning them really good very easy. No matter what you use, its going to need some elbow grease; the universal solvent. I wonder if a slurry of baking soda and/or baking powder with soap might work...
by haklesup
Mon Nov 25, 2019 1:39 pm
Forum: General Discussion
Topic: Transistor Nixie Clock
Replies: 5
Views: 2281

Re: Transistor Nixie Clock

What an Irresistible sales pitch, I have to pass though.
by haklesup
Thu Nov 21, 2019 1:19 pm
Forum: General Discussion
Topic: Help to find a schematic - Coleman PMP3000
Replies: 4
Views: 2022

Re: Help to find a schematic - Coleman PMP3000

horrible reviews on Amazon for this model. One person says 100% guaranteed failure, another says 3.5A no load current on the 12V, another says it kills batteries too fast, not good for small loads. I expect you will find a Made in China somewhere on there. Did you manage to fix it? The ebay schemati...