This Relaxation oscillator using an UJT transistor circuit serves to generate signals for power control devices such as thyristors, TRIACs
LM317 variable voltage regulator circuit diagram.
LM317 characteristics. How the voltage regulator circuit works, Regulator circuit operation improvement
Fire alarm circuit using thermostats and SCR.
This circuit uses several thermostats in parallel for its operation. They can be as many as you want and must be placed in the places where you want to sense the temperature.
Zener diode Voltage regulator calcutation
A Zener diode Voltage regulator calcutation is made using a simple circuit of a resistor /Rs) and a Zener diode (Z).
This two elements values and characteristics are obtained using special formulas
Logic probe circuit with CD4001 IC
This logic probe circuit is useful for people who needs an instrument to measure the logic levels on digital circuits. This circuit is implemented with CMOS IC technology and is recommended for testing circuits using the same technology
Temperature alarm circuit with 741 operational amplifier
This temperature alarm circuit with operational amplifier activates a relay when the temperature of the place to be controlled exceeds a set level. Useful for an oven temperature control or a cooling system
Car Battery Monitor Circuit
This Car battery monitor circuit is very simple and very interesting. How many times have you found that the car does not start because the battery is discharged?
555 IC Tester Circuit (PCB)
This 555 IC tester circuit, allows us to make sure that this integrated circuit works properly. This same test can be achieved by operating the 555 as astable multivibrator, but this test does not allow
to observe its operation in detail.
JK Flip-Flop – PRESET & CLEAR Inputs – Truth Table
The JK Flip-Flop is a sequential device with 3 inputs (J, K, CLK (clock signal)) and 2 outputs (Q and Q’). J and K are control inputs.
Car Battery Booster Circuit
This Car Battery Booster Circuit, is very useful when the car battery has low charge or does not deliver the expected current to operate the starter motor.
Over-temperature alarm using operational amplifier.
This over-temperature alarm circuit uses a common semiconductor diode as a temperature sensing element.
