LJC2200 infrared ultrasonic and radio remote control receiver circuit diagram
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Ultrasonic insect repellent circuit
Electrical pulses are generated by the output of the first base circuit pin and sent through the R6 piezoelectric speaker, which converts the electrical pulses into ultrasonic waves. The circuit operates on a simple sweep principle, utilizing the transformer’s secondary...
Infrared Alarm
This circuit consists of two parts, the first part will transmit a signal, and the second part will detect that signal and trigger a relay. To adjust the circuit, hold down S1 while pointing LED1 at the receiver. Adjust R6...
Wireless-fm-microphone
Transistor Q1 functions as an amplifier for the condenser microphone MIC1. The output from Q1 is fed to the base of transistor Q2 through a 4.7 µF capacitor. Capacitors C2 and L1 form an LC tank circuit, which is utilized...
Wireless IR Headphones circuit
This wireless infrared (IR) headphones circuit project enables the transmission of audio signals through an infrared connection. The circuit consists of two main components: a transmitter and a receiver. Unlike radio frequency (RF) transmitters, both parts of this application must...
Infrared transmitter circuit schematic
This infrared transmitter utilizes pulse width modulation (PWM). The transmitter is equipped with an LM567 tone decoder circuit. An audio signal (at least 50 mV peak-to-peak) is amplified with transistor T1 and subsequently used to modulate IC1. The frequency of...
Old-Time Radio
This circuit was utilized in the early days of radio for signal reception. It can employ nearly any battery-operated triode, such as a type 30. The "A" battery provides 3 V, R2 is a 100-ohm rheostat, and the coils are...
Wireless Lock Tone
Upon acquiring the car, it was appreciated that it did not emit a "chirp" or sound the horn each time the doors were locked or unlocked. There are occasions when discreetness is preferred regarding entering or exiting the vehicle. However,...
InfraRed Remote Switch
This Project REMOTE CONTROLLED SWITCH BOARD is used to switch on/off the Home Appliances by using a standard Remote control. The system is used to switch on/off up to six electrical devices. All the above processes are controlled by the...
ir detector circuit
The human eye is highly sensitive to visible light but cannot detect infrared (IR) radiation. This limitation can make it challenging to test or verify equipment that emits infrared radiation. An IR detector circuit has been developed to address this...