Circuit diagrams and schematics - Electronic projects

When activated by pressing a button, this time delay relay will activate a load after a specified amount of time. This time is adjustable to whatever you want simply by changing the value of a resistor and/or capacitor. The current capacity of the circuit is only limited by what kind of relay you decide to [...]

Here is the tone generator circuit,it is small size. I use IC digital Cmos 4011 quad NAND gate. This will cause another NAND gate to pulse oscillater which will drive another gate to output a 1.3KHz tone. The transistor provides drive for the 8 ohm speaker. The IC 4011 ‘s Input pin 1 for Control [...]

This is Easy Lamp Flasher, I uses NAND Gates IC 4011. Circuit is an astable multivibrator generating at 50% duty-cycle square wave about 1Hz. The C1 – 47uF capacitors and R1 – resistors are determine the flasher rate frequency. You must uses High current power supply for lamp only. I use power mosfet for driver [...]