Electronics Forum / Basics / March 2007

Greetings Folks
  New to these groups here, and have not checked out any of the
archives yet, so please forgive the simple question if the obvious is
already out there waiting for me...   : )

Im in a bit of a desperate situation. I am trying to get my PIC 16f876
to talk to a Ericsson T28. The T28 has both TX/RX pins and I have
connected them directly to the TX/RX pins on my PIC. I measured the
voltage across the VDD and GND on the phone and I am running my PIC at

I have a PSU parrt design problem.
It should receive 24V AC input to get 12V DC.
It start with a snub circuit, which is a varistor. The second is the
bridge rectifier, which should gives out  full wave rectified DC. Then

Does anyone know of how I can relate the importance of the monostable
multivibrator to day-to-day applications? I only know of its
application in rising/falling edge detectors

How camcorders work????

We have 30, 32, 34, 36, 40, and 48 gauge Nichrome 80 in 10' and 100'
spools.
Not sure which size to use, try the sample pack of 10' spools of each
gauge.

I'm a little confused about the VGA and Multisync computer monitor
standard.
I know that 15 pins are most common, the pinout being as follows:
http://www.technick.net/public/code/cp_dpage.php?aiocp_dp=pinconvid_vga_15pin

As I mentioned in previous posts, I have this alarm panel that uses
12VDC to power a set of output contacts for an optional sounder
device. The only requirement is that you don't exceed 120 mA current
draw @12VDC for these contacts. Thanks to the help I've gotten here, I

We have been trying to build a prototype of a single-phase power
controller.The amount of power to be output is controlled by a PID
algorithm. The PID algorithm resides in the external flash associated
with a processor. The output from PWM module of the processor controls

I have a digital thermostat that I have modified & interfaced with a
PIC16F88 for some custom automation. The thermostat run on 24VAC and I have
picked off one of the chips a 5VDC source to power the PIC.
All was working well for 6 months without a problem. Lately, when I push a

I am using a 100W, 2 ohm power resistor (old wound cement unit) in a circuit
to do some basic measurements with.  When cold, the resistor measures 2.1
ohms on both of my DMMs.
After use, when the resistor is hot, I attempted to measure the resistance,

anyone point me in the direction of a circuit to take the 5V from USB port
and boost to 5.4V.  My mobile phone requires 5.4v to charge properly.
thanks

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I have been trying to source an AD5220 digital pot in the UK.  I have tried
my usual sources (Maplin etc) plus a good trawl of the web but to no avail
... one guy suggested a company [who's name evades me at the mo] but they
had a high minimum order.