Search found 1538 matches

by dyarker
Tue Sep 03, 2019 7:15 am
Forum: Computer Programming
Topic: some problem during I use this chip in my design
Replies: 1
Views: 182

Re: some problem during I use this chip in my design

I believe you electrically program it once, then only read it. OTP/EPROM as opposed to manufactured with the program in it. It could be fuseable links or what you usually consider an EPROM without the quartz window for UV erasing.
by dyarker
Mon Aug 12, 2019 10:29 am
Forum: Computer Programming
Topic: server fan diagram
Replies: 5
Views: 1171

Re: server fan diagram

Is "several" 8 wires to a 5 pin connector?

https://turkish.alibaba.com/product-det ... 94239.html
by dyarker
Mon Aug 12, 2019 4:01 am
Forum: Computer Programming
Topic: server fan diagram
Replies: 5
Views: 1171

Re: server fan diagram

The labels on the fans say what is needed. 12V DC for both, 1A or 1.23A max draw. For slower speed use a lower voltage, or a series resistor, or (for better efficiency) 12V PWM. For reversible variable speed, apply PWM through an "H" bridge.

Cheers,
by dyarker
Sat Jul 13, 2019 8:36 am
Forum: General Discussion
Topic: What do you call this?
Replies: 12
Views: 2099

Re: What do you call this?

Is other end a yellow RCA connector like the one shown by Janitor TZap?

If yes, then my guess is HDMI video only, not charger.

Cheers,
by dyarker
Mon Jul 08, 2019 9:25 am
Forum: Computer Programming
Topic: Help with Microsoft word 2000
Replies: 10
Views: 1069

Re: Help with Microsoft word 2000

First 3 dots stand for "Do you want to". The second 3 dots for "the existing file?" Rather than retyping the entire sentence from the message box you posted image of. In File Explorer (or Windows Explorer in older Windows), right click on file name or folder name, click Properties, Read only is a ch...
by dyarker
Mon Jul 08, 2019 4:11 am
Forum: Computer Programming
Topic: Help with Microsoft word 2000
Replies: 10
Views: 1069

Re: Help with Microsoft word 2000

I suggest that "this is a test" already exists IN THAT FOLDER. Try another folder. Also, that the file is read-only; so "... replace …" and "Yes" can't work. Try another name. Also a possibility the folder is read-only, or you're trying save in Word's program folder. Cheers, added - the file is open...
by dyarker
Wed Jun 19, 2019 1:25 pm
Forum: General Discussion
Topic: Crazy Phone issues here..
Replies: 16
Views: 3268

Re: Crazy Phone issues here..

Maybe 19AWG?
by dyarker
Fri Jun 14, 2019 1:59 pm
Forum: General Discussion
Topic: Mini amp circuit
Replies: 147
Views: 232313

Re: Mini amp circuit

?? AB?? Both Q5 and Q6 are NPN.

Only Q4 is PNP. It does not need a negative supply. It's collector is toward the most negative which in this case circuit common. And the base can go negative RELATIVE to the emitter.

Cheers,
by dyarker
Thu Jun 06, 2019 9:26 am
Forum: General Discussion
Topic: 1N457 need equivalent
Replies: 12
Views: 3744

Re: 1N457 need equivalent

Use 1N4148 to replace a 1N457.

Whose support is a mess? And, says who?
by dyarker
Wed May 29, 2019 1:15 pm
Forum: General Discussion
Topic: Help with a circuit again
Replies: 5
Views: 2265

Re: Help with a circuit again

bell.png
bell.png (10.96 KiB) Viewed 2220 times
NPN to PNP, reverse diodes, reverse polarized capacitors, pin 1 of optocoupler stays positive.

Cheers,
by dyarker
Mon May 27, 2019 4:30 am
Forum: General Discussion
Topic: Question About Computer ATX PSU
Replies: 3
Views: 1524

Re: Question About Computer ATX PSU

In Windows under "Settings" then "Power and Sleep" change Time to Sleep to "never". Some types of power supply can not regulate the logic supply (often +5V)((or 3.3V on newer)) when the current goes below a minimum. If forced to stay on, the voltage climbs till the mobo is fried. I've also heard of ...
by dyarker
Wed May 22, 2019 5:21 pm
Forum: General Discussion
Topic: Li-Po cell Id.
Replies: 13
Views: 2046

Re: Li-Po cell Id.

Thanks, understand series/parallel.
by dyarker
Wed May 22, 2019 6:47 am
Forum: General Discussion
Topic: Li-Po cell Id.
Replies: 13
Views: 2046

Re: Li-Po cell Id.

Tzap, Aren't the cells in series? That increases the voltage of the pack, it does not increase the AmpHours.
by dyarker
Sun May 12, 2019 2:00 pm
Forum: General Discussion
Topic: jack Question
Replies: 3
Views: 1561

Re: jack Question

http://www.switchcraft.com/Documents/EDG4.pdf#page=91

That shows block without jacks. Scroll up to page 81 for start of 1/4" jacks.

0.173" more in use now.

I searched at Digikey for "1/4" jacks". Open frame may not be style want. Check page 80 for jack schematics.
by dyarker
Sat May 11, 2019 4:23 am
Forum: General Discussion
Topic: [18650] rechargeable battery + super capacitor
Replies: 7
Views: 1671

Re: [18650] rechargeable battery + super capacitor

http://www.vishay.com/docs/28409/196hvc.pdf Haklesup, that looks like one RC time. I don't believe the device can operate at 1/3 of normal supply voltage. Though super caps are small enough for pocket size project. solar3000, At 160mA, I'll GUESS you'll need 3 or more (maybe 10) 45F caps to allow ti...