Running Lights with CD4017
2021-10-11
The 555 Astable generates a clock for this circuit, an oscillator giving a square wave output at pin 3 which is counted by 4017 to give a running lights effect.Read More
A Button and four LED Lights
2020-09-17
Need a design – Simple one button push button to turn on 4 different LED (3mm Dome) every time you press the button. JE USA Attached is a circuit fileRead More
Electronic Fifteen LED Roulette
2020-08-14
The following was submitted on July 11th, 2007. Message: I want to combine Ne555 with 74154 IC.The indication of the outputs must be shown with LED’s but up to soRead More
Millivolt Meter using a LM3914 LED Dot Display
2020-05-01
Here is a easy to read ‘Analog’ Millivoltmeter. Just like the Moving Coil Voltmeter, but does not have that resolution. This gives a easy indication of process progress or parameterRead More
Resistance Measurement Analog LED Meter
2020-01-12
This is a LED Analog Meter, This can be used as a Resistance Meter and Low Impedance Voltmeter for Battery Levels. To measure battery voltage, the R5-R12-R17 etc. part ofRead More
LM555 Voltage Doubler
2020-01-12
This circuit shows the voltage doubler working with a 555. LM555 has good drive 200mA, both Vcc and Gnd. 555 has the advantage of having a high drive as wellRead More
FET Current Source and MOSFET
2020-01-12
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. SimpleRead More
Audio Visual User Interface with Ack
2019-11-21
This circuit is an User Interface part of a Security Alertness Monitor that i designed decades ago. The circuits are here – Digital Circuits – Part 1 The RAM and RTC part is missing,Read More