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Recent Posts

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1
General Discussion / Can someone tell me what kind of programmer I need?
« Last post by unkellsam on February 25, 2017, 00:09:52 AM »
Hi,

I'm fairly new to PCBs, but I need to reprogram this board:

http://imgur.com/a/MEmiI

The chipset appears to be by Maxim, and the programmer connects to the 10-pin JP1 connection. Any help would be appreciated.

What kind of programmer and software would I need for this?
3
General Discussion / Help regarding a smartcard reader for authentication!
« Last post by Acraze on January 24, 2017, 13:47:08 PM »
I'm working on my final yar graduatr project and I need some help as i am not able to build a smarcard reader or make one available! I need continuous monitoring so rfids wont work!
 Plz help
4
General Discussion / reference air compressor solder paste dispenser
« Last post by sam on January 20, 2017, 14:23:56 PM »
Hello,

I m looking for a cheap air compressor to use with an solder paste dispenser feita 982

Thank you
5
General Discussion / Re: Free online electronic circuit design tool
« Last post by Forby on January 16, 2017, 08:03:48 AM »
Thanks for the helpful tool Max.
6
Your projects / manchester code controller needed
« Last post by dennis48089 on January 10, 2017, 21:10:17 PM »
I have an animatronics show and I need some help designing or making a controller that will make the manchester fm2 code. This system from R A Gray uses the manchester fm2 code and square waves. I'm envisioning using some kind of arduino or raspberry pi with a midi keyboard to do this.  I know theres a lot of smart people in here and I would appreciate some help here!
7
Your projects / Re: Palmsize quadcopter
« Last post by Leo_ha on December 28, 2016, 07:59:56 AM »
thanks , if you interested ,maybe you can see  www.pcbgogo.com/f ,really recommend.. ;D ;D ;D ;D ;D

I used seeed studio fusion to make a small run 1 months ago and was pleased with the service.
8
Digital discussion / Selecting Resistors and Caps of Astable 555 Timer
« Last post by NMTrains on December 22, 2016, 22:33:27 PM »
I've used the calculators many times for 555 Astable circuits often with good results.

This morning I ran into a 40Hz problem where all calculators agree on the 3 components, including even a hand calculation and I have to use a capacitor that is way different from what the calculations say.

To get about 42 Hz, I have in the circuit R1 6.8K, R2 22K C 4.7uf

All calculations say this give a frequency of 6Hz

Holding the resistors constant, to get 42 Hz, the calculators say C should be .68 uf.

Almost 1 order of magnitude difference.

What am I not understanding?
9
General Discussion / 10m IR remote control
« Last post by Scuba2 on December 12, 2016, 01:16:36 AM »
I looked at your IR video , as I have failed to make one.
I have a 38k receiver a mosfet and led to detect an IR presence. I tried 3 remote controls and all work over 10m so I took out the IR led.
I then proceeded to blow it up!
So I tried two of my cheap Chinese led's connected to the diner remote .
They worked perfectly!
Having found a circuit for a remote , it looks like they use very little resistance and high current , but for very short duration.

http://www.ti.com/lit/an/slla175/slla175.pdf

I will have another go at the weekend but if anyone has any advice it would be great.
10
General Discussion / Re: Flexible 555 LED Pulsing (Breathing) Circuit
« Last post by kam on November 23, 2016, 09:29:41 AM »
Good Job!
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