Circuit Schematic Diagram

light dark activated relay circuit electronic

Dark and Light Activated Relay

This is the basic dark and light sensor which using photoresistor as sensing component. The transistor act like as a switch, when the “switch” in on condition then the relay will be activated.

25W HiFi Audio Amplifier with MOSFET

This is high fidelity, high quality 25W HiFi audio amplifier circuit delivers great audio performance. You don’t need pre amplifier circuit for this design since it can be directly connected to the input devices such as […]

simple fire alarm based NE555

Simple Fire Alarm with Thermistor and NE555

The following circuit is a simple fire alarm circuit based NE555 timer and use thermistor as a temperature detector. This sensor will activate the transistor when the temperature is in high value. The thermistor will have […]

Hum Remover Circuit Electronic

“Hum” Remover

Here is the hum remover circuit diagram. “Hum” usually occured from live audio system, for example: input from microphone. Hum can be removed from an audio signal to get the maximum performance by mixing the actual […]

6V Gel Cell Battery Charger Circuit Diagram

6V Gel Cell Battery Charger

The following scheme diagram is the battery charger circuit for 6V Gel Cell battery type only. Components List: R1 = 22 ohm, 1W R2 = 270 ohm R3 = 220 ohm *R4 = 715 ohm, 1% […]

surround speaker placement

Passive Surround

This is the scheme diagram of passive surround circuit. Passive surround doesn’t need any active components and power supply to make the circuit works. The circuit just need the combination of resistors and electrolytic capacitors. Circuit […]

250mW RF Power Amplifier Kit

250mW RF Power Amplifier

This is an 250mW RF power amplifier circuit project. This circuit is designed to amplify the output of about 7mW wide band FM transmitters to a final level of about 250mW. General purpose 12V DC power […]

3-30V 3A power supply kit

3V-30V/3A Adjustable Regulated Power Supply

The circuit diagram of 3V-30V/3A adjustable regulated power supply. This is an adjustable and regulated power supply with stabilized DC voltage between 3V and 30V provided that the consumption does not exceed 3A direct current. This […]

voice operated relay

Mini Voice Operated Relay

This is the circuit diagram of a voice operated relay. It similar with sound activation switch circuit which will turn on and turn off (connect and disconnect) the switch depending on the sound input. The output […]

Simple Smoke Alarm using Photo Interrupter Module

This is a really simple smoke alarm circuit design. The circuit consists of two important modules that are sensor module using a photo interrupter module and alarm module using a tone generator IC NE555 with astable […]