Electronics Forum / Basics / September 2006

I need a single-supply positive peak detector with a gain of 2. (Previously
I used an op-amp with a gain of 2 followed by a peak detector, but would
like to simplify the circuit.) The input voltage will range from 0V to about
2.5V.

I know that a PNP transistor will not work if the collector is higher than
the emitter but will it be damaged?
Regards,
AJ

I read that the secondary of a high voltage transformer should be
grounded. Why? Will it still work if it's grounded?

I have a function generator that gives out upto 10V (0.1Hz to 4MHz).
Need to add a simple output stage to provide upto 50V for this
bandwidth (will provide dedicated power supply).  Any suggestions for
the configuration?

Could anyone help me with designing a timed igniter for metal halide
lamp which stops
providing pulses to the lamp after 10mins. The circuit that i tried is
described below: -

I have set up a one-shot 555 timer to trigger a relay for a few
seconds. With just that set up, it works fine; I can hear the relay
turn on and  off. With an LED connected to the relay output, it turns
on and off as expected, along with the relay.

Could any one be so kind to explain to me what are the zero ohm
resistors and what are they used for?
Thanks!

I'm trying to find a powersupply or a inverter to connect a small
icebox system based on a Sawafuji compressor swing motor. This icebox
will be installed inside a Westfalia camper.
This system need a 22 or 24 volts AC power. I didn't find anything on

this phone is awesome, check it out!
<a href="www.buyersedge.com/Product/prodDesc.asp?XOS=3850056&pageView=1
">ZyXEL Prestige 2000W v.2</a>

i m new to programming PIC microcontrollers.......recently i built the
JDM  multi pic programmer and tried to program showing "verify failed
at address 0000h" what might be the problem?? plz help me.........

Why, for God's sake, do so many people use the word "amperage" when
there is a perfectly good word, "current", available? Similarly,
"ohmage" for "resistance". I'll expect "faradage" for "capacitance" any
day now.

Some people converting diesels to run on waste vegetable oil have run
into a peculiar problem:  mice have been chewing through fuel lines!
So I had an idea.  Produce some nasty high-frequency sounds.  Something
in the 50 kHz ballpark is supposed to be effective on rodents.  What's

i m new to programming PIC microcontrollers.....recently i built the
JDM programmer and used IC prog to program the PIC16F84.......but it
showed "verify failed at address 0000h".......what might be the
problem.....plz help me....

Which material is currently known to have the highest
breakdown-voltage?
Thanks,
Radium

Hi All, You can see I am a noob. I would like to know how to charge
batteries? For example, if I have a 1.5v AA battery, what circuit can I
use to charge it? Resistors? Caps? what about 12V batt? Thanks, Brian