Donkey sound effect Circuit using IC-555
This is a donkey sound effect project that easy to builds because use simple components include three IC-555 and LM386 and more little parts. Although at present we use Micro controller IC because small. But some times it is hard to find, so this circuit is suitable for everyone. How …
Power Battery Saver Circuit
This is power battery saver circuit using IC-555 timer. The lamp is controlled with PWM model by adjusting of potentiometer P1. PNP power transistor to driver lamp. When use normal lamp,some times a lamp that is used have too bright. To adjust the brightness with the variable resistor, it would …
Simple 555 ICs tester circuit
Most IC-555 is used to generate frequency, and sometimes we need to know. Is it good or bad? But normal multimeter cannot check it. Thus, I make a simple 555 ICs tester circuit. Which is tested correctly and faster. How it works Resistors R1-R3 acts as limit current and reduce …
Idea to build simple frequency meter from old calculator
This circuit use a simple ideal is the calculator count a frequency within range 1 second. This time base is generated by IC-555,on astable multivibrator form. How it works The number on the calculator’s panel is the input frequency. to base of transistor Q2 . The capacitance of C1 should …
Modify a LED chaser circuit into the easy timer
The a LED chaser is popular, so we will modify it into the easy and cheap timer. First,a appliance will works, while respective LEDs will flash, and until all LEDs go out. Then the appliance stop. How it works. In Figure 1 is the circuit. To begin with, to apply …