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.
What is a wirewound resistor?
A Wirewound resistor is a resistor made with a conductive wire of a high resistivity. This wire is made of a special alloy and it is wound on a support tube of refractory material such as ceramics, porcelain, etc.
12 VDC to -12 VDC converter circuit with a 555 IC.
This 12 VDC to -12 VDC converter circuit gives -12VDC (negative 12 volts) from a power source of + 12VDC (positive 12 volts), with very few components.
Temperature gauge circuit using the LM324 IC
The temperature level is displayed using 4 LEDs:
A green LED indicates that the temperature is OK.
Two yellow LEDs indicate that the temperature is higher than normal.
A red LED indicates that the temperature is very high
12V to 9V DC Converter Circuit Diagram (PCB)
This 12V to 9V DC converter is very useful for powering 9V DC devices in a car that uses 12V DC battery. The maximum current consumption allowed by this circuit is 0.8 amps.
