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 voltage to LED1-LED3. Which is […]
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This is an electronic head or tails circuit ,that same really the head or tail playing very little head by following several steps. -First of all,turn on switch, LED display show digit “0”. -Secondly, press the button “rotate” then the coins computer will begin rotate, notice of LED1 will be light, wait until LED1 go […]
This is an true r.m.s. Converter circuit. Normally we need a device with low tolerances,and very accurate tuning. But this circuit is used a simple device, plain and decent quality. This circuit use principle of automatic gain control (AGC). Which include of two ICs ,number of XR 13600 (A1 and A2) and XR 1458 (A3, […]
This is a Dual RS232 switch selector circuit to one computer that have one RS232 port into two ports for two computers. In circuit is simple and cheap without ICs so easy to build. Normally, we will always use the D connector because strong, can be put off for several times without damage. If removed […]
This is the high quality PWM 12V-24V DC motor controller circuit for that has the low voltage battery checker system, working with soft start, adjust pulse frequency, use for 12V or 24V battery at current up to 20A. Although small and simple, but could be easily used to create an easy, no need to program […]