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Homemade RF car remote
I am looking for help or advice on where to research the protocol used in car remotes. I am pondering building a remote to work on my Nissan, Honda, and Ford vehicles rather than...
Wednesday, 4 September 2013 - 01:32
Zener diode question - resistor on Anode!!
I am attempting to repair a power supply for a friend and see something I have never seen in all my years in electronics. There is a resistor on the anode of a zener diode - in...
Monday, 12 August 2013 - 12:21
Dallas EEPROM interface question
Hello, I am using Codevision to write code that interfaces with a MAXIM/DALLAS DS28EC20 1-wire EEPROM with the Mega128. I am struggling o understand this... Codevision comes with...
Tuesday, 9 July 2013 - 17:53
ATMEGA 128 1-wire port setup problems with Codevision
Hello, I am using a Mega128 and trying to setup the 1-wire interface for a Dallas EEPROM. I can't get it to compile. The comment in Codevision's 1wire.h says: BEFORE #include...
Tuesday, 2 July 2013 - 18:22
Capacitors for camera flash circuit
I am building a circuit for a camera flash and need to produce about 500 of them. Overall the circuit seems simple from a hardware standpoint except for the capacitor. A camera...
Monday, 1 April 2013 - 13:35
Can 4000 series CMOS chips latch up?
I am debugging a motor controller that has a failed NPN transistor, shorted collector to emitter. I think the controller logic which turns on the base got stuck high. It got me...
Friday, 7 October 2011 - 00:55
Enclosure for electronic project - drilling holes
Hi everyone, I am in the process of designing a circuit board with a 2 inch speaker. The board will be inserted into a PVC enclosure with a 2" hole in which the speaker will sit...
Saturday, 17 September 2011 - 22:56
Driving a piezo transducer
I am building an alarm with a piezo horn transducer. The board runs on a 9V battery but I need a 30 volt square wave to slam the piezo. I tried a transformer but the secondary...
Monday, 20 December 2010 - 23:38
How do adapt XLR to RCA audio plug?
Hello. How do I adapt an audio output having an XLR connector, to an RCA (stereo) connector? The manual shows the XLR connector has a three pinout of HOT, COLD and GROUND. If I...
Sunday, 6 December 2009 - 20:44
Help needed with MOSFET switch
Hi all, I am using a photovoltaic IC from International Rectifier (part number: PVI-N). I am using it as an opto-isolated gate drive for a large power mosfet. Here is the...
Friday, 9 January 2009 - 19:03
Breaking AC current at non-zero crossing
Time to pick your brain. I am trying to break AC current (remove power) with a solid state device, but at random phase crossing. I cannot wait for zero crossing. I tried a...
Thursday, 18 December 2008 - 11:38
What is the turn off time of an LED?
Does anyone know how long an LED will illuminate after power is removed from it? There must be some sort of time.
Friday, 15 August 2008 - 21:42