Hobby Electronics Basics

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Help with control by wire - circuit needed

I am after a PWM circuit that can be used to help me build a two wheeled carry cart. I will want to be able to control...
3 comments posted 22yrs
posted by Gadgetfreak_2000
3 comments posted 22yrs posted by Gadgetfreak_2000

offset null pins to ground?

Hey all; I'm using a high speed opamp as a voltage follower. I'm not using the offset null pins - should I tie them to g...
4 comments posted 22yrs
posted by toccata
4 comments posted 22yrs posted by toccata

chipcon cc1020 problem

Hello I have to make a simple radio link using a CC1020. I have a development kit and SmartRF 5.3 software. I have also...
0 comments posted 22yrs
posted by pjaros
0 comments posted 22yrs posted by pjaros

anyone familiar with ramsey fm25b?

hi all, i just assembled a ramsey fm25b kit and am having some problems setting the frequency. changing the frequency w...
3 comments posted 22yrs
posted by micahgearhart
3 comments posted 22yrs posted by micahgearhart

capacitor choices

I am upgrading a circuit I inherited... a controller with an ADC to measure various DC voltages (0 - 2.5VDC). The analo...
4 comments posted 22yrs
posted by fritzo_two_
4 comments posted 22yrs posted by fritzo_two_

How to add attenucation to simple circuit

I've been testing my line with a dsl router that I have. I would like to know if there is a simple circuit that I could...
0 comments posted 22yrs
posted by cglobal25
0 comments posted 22yrs posted by cglobal25

Formula for gain?

How do I find the gain for the High Gain Amplifier in the manual of the lm317 page 16 http://www.national.com/ds.cgi/LM...
10 comments posted 22yrs
posted by littlebilly
10 comments posted 22yrs posted by littlebilly

Converting a Headlight into a Lamp

Hi, I'm converting an HID Nissan Altima headlight into a light that you can plug into a wall outlet, but I'm having trou...
2 comments posted 22yrs
posted by dsoc21
2 comments posted 22yrs posted by dsoc21

DC Voltage Doubler

Hello What's the best (easiest) way to double a 9V DC supply to 18V DC? The 9V comes from a 78L09 regulator. The curren...
5 comments posted 22yrs
posted by John
5 comments posted 22yrs posted by John

inductor switch protection diode

I'm using this circuit to control a short (1s) pulse of 14A through an electromagnet coil. The coil is 3 separate windi...
7 comments posted 22yrs
posted by news4
7 comments posted 22yrs posted by news4

standard footprints

I'm hoping someone can give a noob some direction here. I've started designing a pcb using electronics workbench and am...
11 comments posted 22yrs
posted by james
11 comments posted 22yrs posted by james

why are they called wall warts?

The subject says it all. Anybody know? Thanks, Eric
17 comments posted 22yrs
posted by etpm
17 comments posted 22yrs posted by etpm

What is a power follower ?

I heard of an emitter follower, but what is a power follower? I found this circuit in page 15 of the lm317 manual http:/...
3 comments posted 22yrs
posted by littlebilly
3 comments posted 22yrs posted by littlebilly

50Hz Filter

Hi, I've made a simple circuit which consists of an ultrasonic transmitter and reciever. I send out 40KHz pulses and wh...
10 comments posted 22yrs
posted by Ed
10 comments posted 22yrs posted by Ed

Textbook for Optoelectronics Design?

I am seeking a textbook covering opto-electronics design. I am building various optical communications circuits using d...
0 comments posted 22yrs
posted by sonnichs
0 comments posted 22yrs posted by sonnichs