OR gate with two 555
This shows how to OR gate two 555, when one 555 cycles at a low frequency a valve turns on an off, the second 555 stretches the ON duration of the pulse with a...
Category: Hobby-Circuits
Metal Detector Circuits Problem
With the best wishes for you. I found your address and browsed your website. I have a question and hope to take your help and answer. I need to good metal detector’s circuit and...
What is Saturation in Transistors
Date 8/30/06 Simon and delabs Simon: hello, delabs: hello Simon: we have many meanings for saturation, delabs: means turning on, also means no longer linear, or it is got fixed up, not varying in...
Working with SMD and SMT PCB
One thing tho, i would like to request you to send me some procedures on how to work with surface mount devices (SMD’s). I cant get the IC as DIP so i have no...
FET Current Source and MOSFET
This is a constant current source using a FET. This is the most simple replacement to series resistor to limit current. The N-Channel FET BF256C can give 15mA current. Simple Methods Before you get...
Perpetual Candle – White LED Lamp on Ni-Cd
This is a easy to build LED lamp circuit for Learning and building skills. This is the first draft schematic V 1.0. It will need improvements for Higher Power Lighting. I will give a...
Constant Current Source LED Drive
This is a Constant Current Source LED Driver, When the LED driver Upper-NPN is driven by a voltage thru 4.7K the LED lights up. Assume that the Lower-NPN at bottom is absent. The current...
Digital to Analog with R2R Ladder Network
This is a R-2R Digital to Analog Converter, It converts a byte (8 bit) to a analog value. It has 256 levels including zero. This was the first Digital Pot i Built decades back...
