Hobby Electronics Basics

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Varactor ?

Looking at the datasheet for the NTE618, and wondering why it lists a frequency (1MHz) after each entry for the interte...
12 comments posted 17yrs
posted by db5151
12 comments posted 17yrs posted by db5151

want to build a VHF sounder device

Please could someone advise me where I can get a kit or even instructions to build a device that emits a very high freq...
4 comments posted 17yrs
posted by invalid
4 comments posted 17yrs posted by invalid

phase/frequency detector

In a specific application I should compare the phase/frequency of two signals and make a voltage proportional to their...
4 comments posted 17yrs
posted by jghasemi
4 comments posted 17yrs posted by jghasemi

half wave rectifier

Setup: transformer, single rectifier in series with a load resistor. Will the power company still bill me for the half o...
4 comments posted 17yrs
posted by mrdarrett
4 comments posted 17yrs posted by mrdarrett

Need help with a MOSFET electronic load

I have been looking at some electronic load circuits. I would like to have a circuit that uses a MOSFET that pretends i...
7 comments posted 18yrs
posted by jalbers
7 comments posted 18yrs posted by jalbers

question about DIP package and SMT adapters

I'm trying to work on a circuit on a standard perf board I got from radio shack... and it works fine for all the DIP ch...
7 comments posted 18yrs
posted by panfilero
7 comments posted 18yrs posted by panfilero

will a dc offset affect a speaker?

ok... here's my question: If I have a millivolt range audio signal and I add a dc offset to it, and then I take my new...
55 comments posted 18yrs
posted by panfilero
55 comments posted 18yrs posted by panfilero

High Current LED flasher

Could someone please walk through how this circuit works breaking it down into bite size pieces? https://ilocker.bsu.ed...
7 comments posted 18yrs
posted by jalbers
7 comments posted 18yrs posted by jalbers

ISD1700 help

Hi, I build the stand alone circuit for the ISD1750 Windbond chip. The circuit is pretty straight forward in the datash...
0 comments posted 18yrs
posted by lerameur
0 comments posted 18yrs posted by lerameur

music amplifier

I need to amplify the sound from a 9 volt dc audible probe circuit. The probe provides a very low musical melody sound...
4 comments posted 18yrs
posted by kvsteve
4 comments posted 18yrs posted by kvsteve

designing a radio amplifier

Hi guys. have recently graduated with mechanicanical engineering. Here i'm faced with challenge of coming up with amplif...
4 comments posted 18yrs
posted by musili.ndili256
4 comments posted 18yrs posted by musili.ndili256

Multimeter or Oscilliscope

Hi, all I want to measure a DC output precisely. Do I use a multimeter or oscilliscope? I found there always are some m...
5 comments posted 18yrs
posted by jasonleehan
5 comments posted 18yrs posted by jasonleehan