Bird Bath Fountain Monitor
by T.K. Hareendran in 555 | Hobby | Tested |
A bird bath fountain (a small shallow pond-created with a water-filled basin- in which birds may bath and from which they may drink) can be a garden ornament, small reflecting pool, outdoor sculpture, and part of creating a vital wildlife garden. It is an attraction for many different species of birds to visit gardens,...
Automatic Water Tap (Faucet/Valve) Controller
by T.K. Hareendran in 555 | Tested |
As you may well know, automatic control for a water tap can significantly reduce water consumption to some extent. Besides, automatic faucets can eliminate cross-contamination by keeping hands and germs away from commonly-used surfaces. Presented here is a simple electronic circuit which can control the valve operation by...
by T.K. Hareendran in 555 | Alarms | Tested |
Here is another interesting hobby circuit built around the popular and inexpensive 555 IC. It is nothing but a water sensor, which you can be configured as a rain alarm, water tank overflow alarm, aquarium water leak indicator, etc. It can be powered from any 6VDC supply. Initially, when DC supply is fed to the circuit the Red...
by Popescu Marian in 555 | Audio |
Here is a very simple Kojak siren that is built with two 555 timer ICs and has 2 linear potentiometers that allows the control of sound speed and tone. IC2 produces a sound that can be adjusted with P2 and then drives a small speaker. The amplitude of the signal is modulated by IC1 with a low frequency signal. The modulation...
Long Duration Timer
by Popescu Marian in 555 |
In order to create a long duration timer the 556 IC teamed up with a binary divider can provide delays as much as 16 times that set by the time constant of the first timer. You can use two 555 ICs instead of the 556. The first timer provides a delay of 7.5 minutes and the divided outputs give a delay of 15 min, 30 min, 1 hour...
555 Ignition Coil Driver
by Jim Keith in 555 | Tested | Useful |
This ignition coil driver is a HOT one! From my recollection, it delivers a nastier spark than the legendary Ford Model T ignition coil. The circuit uses an inverted 555 oscillator that is coupled to an ON Semiconductor BU323Z Darlington transistor (350V, 10A) that drives a conventional inductive discharge ignition coil. In...