Keep watching for more of these little giants, I mean simple circuits to build with huge potentials. This circuit will produce a nice little buzzing sound well before you tank spills over. No more peeping and nervous apprehensions with overflowing water tanks.
If the connected crystal is a good one, will be indicated through the illuminated bulb, a faulty crystal will keep the lamp shut. The shown circuit is basically a standard Colpitts oscillator incorporating a crystal to initiate its oscillations. Crystal Tester:Ĭrystals can be quite unfamiliar components especially with the electronic novices. In the present design it’s around 1 minute. The time delay is determined by the values of R1 and C1. Pressing the push ON switch instantly charges the 1000uF capacitor and switching ON the transistors and the relay.Įven after releasing the switch the circuit holds on the position until C1 is completely discharged. Simple Delay TimerĪ very simple yet very effective timer circuit can be designed by incorporating just two transistors and other handful of components. Pressing the upper push switch energizes the circuit and the load, whereas it is deactivated by pressing the lower push button. This circuit also utilizes a very few components and will faithfully set and reset the relay and the output load according to the input commands.
0 kommentar(er)
