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
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
Printer Port 256 Relays 16K Dot Matrix
2020-02-25
Using this circuit on Printer Port, one could drive 256 Relays or 16K LEDs as Dot Matrix display. It can be used to drive a Large size multiplexed LED dotRead More
Seven Segment LED display
2020-01-13
how is the circuit for driving a seven segment led mail from EA A 7 segment LED display is used to display a number 0-9 using 7 LEDs, The circuitRead More
Sample and Hold with Standby CD4053
2018-08-20
A, B, and C are the Digital Control for x, y and z input and output pairs.The voltage at Vinx is stored in C1 when A goes high, when ARead More
High Resistance Meter
2018-05-19
I don’t remember if this circuit worked properly. But a few were made and i might not have shown the modifications that were done to make it work. This wasRead More
1 Hz or 1 PPS Crystal Clock Base
2017-11-18
The CD4020BC, CD4060BC are 14-stage ripple carry binary counters, and the CD4040BC is a 12-stage ripple carry binary counter. The counters are advanced one count on the negative transition ofRead More
Crystal Oscillator – Parallel Resonant
2017-11-18
74HCU04 is a chip that was made for this purpose, HCT may not work for such a circuit. C1 and C2 can go to upto 33pF and R2 can beRead More