Subscribe by email

Simple 555 timer circuits

Free simple 555 timer circuits electronics projects with explanation and diagrams. Huge collection of electronics projects based on the 555 timer circuit or equivalent integrated circuits.

Tachometer circuit using 555 timer

A very simple tachometer circuit can be designed using a 555 timer, like in this circuit diagram . An electrical signal taken from the low tension side of the distributor is converted into a voltage proportional to engine rpm and this voltage is displayed on a meter calibrated accordingly .

DC motor speed control circuit diagram using 555 timer

A very simple dc motor speed controller circuit can be designed using circuit that can be used to design a small drill project.

555 timer circuit tester

A very simple 555 timer tester circuit is designed using 555 timer integrated circuit. With a 555 timer circuit connected in the slot we can detect if timer is working properly . The 555 timer tester circuit above is basically a led flasher circuit but with the 555 removed.
When you have a good 555 under test, the hi and lo leds are flashing steadily. If you have a defective 555 timer you may get both leds off, one or both on steady, or one or both on faintly. In all these case the 555 is defective.


Subscribe to RSS - 555 timer circuits