Are you having a headache because of the number of relays?

This project helps you solve it.

Even the clock signal is made of relays. There are 25 relays in total, which just fills 10*10.

Welding process:

Prepare materials

Solder the resistor and diode first

led

Transistors and chips

Tall components

relay

Backside solder joint

Technical Difficulties

Since the power supply of ne555 and the relay are not separated, and the relay uses 5V (larger current at the same power), the 555 oscillates unstable. Connecting pin 5 to ground with a capacitor, and connecting the input in parallel to a large pond did not improve much. Only by increasing the power supply to 7.5V did the improvement improve.

I dreamed of going back to school and used AC contactors to make a 4096 hexadecimal counter in the electric mop room:

(The original video has long been deleted, and this compressed version remains, but the sound is quite impressive)