Search found 1460 matches

by dyarker
Tue Jan 10, 2017 12:09 pm
Forum: General Discussion
Topic: 120v to 4800 v transformer
Replies: 14
Views: 2585

Re: 120v to 4800 v transformer

1. He said in post 1 the 120V winding was 10mA.

2. For the amount of iron, 1.2W makes more sense than 48W.(see left side of photo in post 3)
by dyarker
Mon Jan 09, 2017 3:07 pm
Forum: General Discussion
Topic: looking for a led driver board
Replies: 19
Views: 3079

Re: looking for a led driver board

I'll believe you, but it isn't easy. Pulse frequeny? Peak current?
by dyarker
Sun Jan 08, 2017 8:18 am
Forum: General Discussion
Topic: looking for a led driver board
Replies: 19
Views: 3079

Re: looking for a led driver board

Two ways - 1. Double the resistance to halve the brightness, a fixed amount of dimming. 2. In first post you said " ... i wan to make me a new display that is arduino controlled." Do PWM dimming in code in the microprocessor. For example (for "on" segments) 10mS on 0mS off is 100% brightness, 9mS on...
by dyarker
Sat Jan 07, 2017 3:32 pm
Forum: General Discussion
Topic: looking for a led driver board
Replies: 19
Views: 3079

Re: looking for a led driver board

2nd try. pressed submit before, and everything just d i s a p p e a r e d Net access my end, not Nutvolts forum 3 LEDs in series more economical than parrallel, but takes higher than logic supply. Red LEDs are probably 1.8V or 2.0V each. So 3 in series are 5.4V or 6V. To have some voltage for the cu...
by dyarker
Fri Jan 06, 2017 9:27 am
Forum: General Discussion
Topic: looking for a led driver board
Replies: 19
Views: 3079

Re: looking for a led driver board

How many LEDs per segment? What color?
by dyarker
Mon Jan 02, 2017 11:49 am
Forum: General Discussion
Topic: Tutorial on protected Li-ion cells...
Replies: 3
Views: 812

Re: Tutorial on protected Li-ion cells...

A bypass. So when fully charged the transistor that connects end to inside turns off, and an additional transistor that connects end to that wire that goes to other end turns on. All current "goes around" instead of through the cell between the ends. May need a second wire on the side for bias for t...
by dyarker
Sun Dec 18, 2016 6:13 am
Forum: General Discussion
Topic: USB Hub Power Supply Causing Huge Problem!
Replies: 10
Views: 1727

Re: USB Hub Power Supply Causing Huge Problem!

Cutting the +5 wire in the cable from PC USB Port to the USB Hub means the PC now supplies zero power to the Hub. More important no power can flow back from hub to PC messing with sensors in PC power supply. Depends on type of USB device(s) plugged into hub. If I remember correctly, a USB port may s...
by dyarker
Sun Dec 11, 2016 5:48 am
Forum: General Discussion
Topic: Help Finding a Rotary Encoder for Simple Arduino project?
Replies: 2
Views: 925

Re: Help Finding a Rotary Encoder for Simple Arduino project

You need two transmissive optical switches, either IC output or photo transistor output. Here is link to a page of IC types - http://www.mouser.com/Optoelectronics/Optical-Switches/Optical-Switches-Transmissive-Photo-IC-Output/_/N-abusp/ The toothed disk in the video looks hand-made. Perhaps you can...
by dyarker
Wed Nov 23, 2016 10:53 am
Forum: General Discussion
Topic: About Vizio again!
Replies: 18
Views: 2993

Re: About Vizio again!

LEDs dying? Too much current and/or area where they are installed gets too hot.
by dyarker
Wed Oct 12, 2016 4:20 am
Forum: General Discussion
Topic: Bit of a puzzle
Replies: 7
Views: 1396

Re: Bit of a puzzle

I inderstand this model has been discontinued a few years ago.
Yeah, worked too well! They couldn't sell a replacement battery every 6 months, hee, hee.
by dyarker
Tue Oct 11, 2016 4:06 am
Forum: General Discussion
Topic: Bit of a puzzle
Replies: 7
Views: 1396

Re: Bit of a puzzle

Is there a trigger switch? (Pres or squeeze to do a count.)

My EWAG is that everything is off till trigger, circuits inside boot, light LED, do count, store result in static RAM; and power down again. Whole process under a second.
by dyarker
Thu Sep 29, 2016 3:45 am
Forum: General Discussion
Topic: Need a Schematic for: NEWCOMB Model: B-100A AM Radio
Replies: 13
Views: 2107

Re: Need a Schematic for: NEWCOMB Model: B-100A AM Radio

Is this - http://robert.guildig.org/2013/07/newcomb-b-100-schematics.html one of the ones that don't look quite the same? Even if case is a bit different, schematics are probably close. If this is the one, I only see one power transformer. The other is the speaker impedence matching transformer. Whi...
by dyarker
Wed Aug 24, 2016 4:27 am
Forum: General Discussion
Topic: Vote for new moderators
Replies: 10
Views: 1547

Re: Vote for new moderators

I think you have the wrong idea what moderators do. They stop advertizers. They keep argueing members civil. They do not suggest topics or create content (as moderators), It's more like policing, and buffering technical problems with the forum. They are volunteers who are also members. As members th...
by dyarker
Fri Jul 01, 2016 2:44 pm
Forum: General Discussion
Topic: i need help with NanoStations loco M5..
Replies: 13
Views: 2119

Re: i need help with NanoStations loco M5..

That is why I'm sticking with it!

But we truely do need the IP number the PC had before so that new IP numbers for the M5s will be same network (first 3 bytes). Otherwise you will not be able to communicate after the change in M5 and then put PC back to normal.
by dyarker
Fri Jul 01, 2016 7:23 am
Forum: General Discussion
Topic: i need help with NanoStations loco M5..
Replies: 13
Views: 2119

Re: i need help with NanoStations loco M5..

By not checking the IP of PC before changing things we don't know what network portion of IP number to use for M5s new IPs. And 10 or 11 might be the host portion assigned to the PC by DHCP in the router. In which case that number can NOT be used for fixed IP of M5. It is very irritating when someon...