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 […]
Digital-Circuits
Printer Port 256 Relays 16K Dot Matrix
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 […]
Seven Segment LED display
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 […]
Sample and Hold with Standby CD4053
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 […]
High Resistance Meter
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 […]
1 Hz or 1 PPS Crystal Clock Base
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 […]
Crystal Oscillator – Parallel Resonant
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 […]
Multiplexed Presettable Timer with ICM7217
This was a attempt to make a Sequential Timer with ICM7217 of Intersil, even though it worked well, it was not developed beyond the prototype […]