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
Voltage to Current Convertor using LM723
2021-07-09
his Circuit converts a voltage control output from a Process Controller to be converted into a Current Control if the AC-Drive or Valve needs a Current Control Signal.. Significance ofRead More
OR gate with two 555
2021-04-17
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 ofRead More
555 multivibrator like power oscillator
2020-02-15
This is dual 555 multivibrator like power oscillator. This is my contraption and conception but couple of decades old. It appears to have errors. It worked but the document fixingRead 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
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
Display On Timer with 555
2019-09-10
This is related to the earlier post. This was done to save battery power. The output of some equipment may be in the form of LED Annunciators In the SecurityRead More
Drive SCR thyristor with 555
2018-03-27
This circuit gives a burst of pulses to fire 2 SCRs, when pin 4 is taken to 12V the SCR is turned on, to use this circuit you need 12VRead More