Electronics Forum / Basics / May 2004

I am looking for a newsgroup (s) to Post To and sell the following:
""
HONEYWELL OPTO ELECTRONIC SENSORS
P/N  HOA-6981-P51

I have a few op amps driving a ph probe inital value .059mv/unit boosted
to 4 and offset by 2 volts ... anyhow the valies i read are correct, but
once i plug the serial from my pc to a db9 / max232 std config the
readings go off  totally, the max232 is using 10uf/50v from power ...

I'm trying tu build an effect for my guitar
http://www.generalguitargadgets.com/v2/diagrams/sonic_sc.gif
and apparently to the output of the guitar im supposed to connect a stereo
jack..tip goes to the battery -9.?! Isn't the output is a mono signal ? im

i'm trying to learn electronics but don't know where i should start; where
would you reccomend?

This makes me very horny, try it yourself.

I would like to sell the following rare technical books.
When you buy these books, you can pay by paypal, check (in the US
only), money order or bank wire. We will send the books priority mail
in the US at our expense. For overseas shipping rates, please ask,

I am trying to drive a 9vdc motor using a pic microcontroller. I build
the h-bridge but it is not working.
The problem is that :
The transistor is functioning more or less as a relay . So this

This curcuit apparently does not need inductors for C2, C7 and C8.
Apparently ZI went to Carleton Univeristy and asked a graduate student who
is specialising in switching type power supplys. He said to me that a series
inductor for the above caps is not required because the final ...

I have recently bought a rev counter for an old car I am currently
restoring. The electronic problem I am having is the rev counter seems
to be reading about half of what it should be! Is there an easy fix to
this by means of changing resistors or am I stuck! I have taken the

A beginners question: can someone explain me what an Ethernet MAC does (like
the one from Realtek) and what is the advatage of an MII interface?
kind regards
Stijn

I'm a software developer that has recently decided that electronics
would be a *fun* hobby.  i'm not too far into it and I'm already
stumped...  In this little project that I've invented for myself I'm
trying to light an array of twelve flashlight bulbs simultaneously...

Looking for a circuit diagram  (on trip board)  that utilizes ic 555, using
12V AC power input that:
On when pressing a switch
Off when pressing the same switch

How do I get a piezo-electric buzzer to make an audible sound?  I've heard
that I need an IC circuit to
'drive' the buzzer, but I can't seem to find out what an IC driver circuit
consists of.

What transformer do I need to run 3 dildos wired in parallel, each
rated at 1/2 amp for six volts DC
Marge

Sorry if this is off topic but I have another question to help with the
revision for my exam (it's tomorrow).
Why would a finite state machine be an appropriate method of implementing
the control logic of a drinks vending machine?