Remote control recetver
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Rfrxd0420 Ask Receiver Reference Design
The RFRXD0420 and RFRXD0920 are low-cost, compact, single-frequency short-range radio receivers that require only a minimal number of external components for a complete receiver system. The RFRXD0420 operates within the frequency range of 300 MHz to 450 MHz, while the...
Receiver/Scanner Preamp Circuit
The low-cost Mini-Circuits MAR-X series of chips provides a significant advantage for RF builders, featuring inherent 50-ohm input and output impedances essential for RF systems. An MAR-1-based receiver/scanner preamplifier is illustrated. Capacitors Ci and C2 are chip capacitors, with values...
Homemade wireless remote control circuit diagram
The homemade wireless remote control circuit diagram illustrates a motor remote control transmitter circuit. The circuit utilizes a 555 timer along with resistors R1, R2, RP1, diodes VD1, VD2, and capacitor C1 to create a variable duty cycle astable oscillator....
One kind of wireless remote control circuit
The remote control transmitter consists of a DTMF generator and an FM transmitter circuit. A UM91214B phone-specific integrated circuit (IC) is utilized to generate the DTMF signal, with a 3V power supply provided by a 3V zener diode (D1). The...
IR Link PIC tranceiver
I just finished a half duplex serial asynchronous link from a simple PIC circuit to the RCX. It is able to receive codes from the RCX (or Lego RCX remote control), store them in RAM & EEPROM, and transmit any...
Emergency Egg Locator Beacon (EELB)
This project was inspired by a circuit that a friend, Simon Field, showcased. He built a simple transmitter circuit using a 1 MHz "can" oscillator and a serial connector. In his circuit, he utilized a computer to turn the transmitter...
100 MHz RF oscillator with ATtiny12
A frequency reference for tuning up the RS-232 to 100 MHz RF desktop channel adapter elsewhere on this site, when I found this Saronix crystal oscillator in my junk box. A few minutes with AVRStudio produced an ATtiny12 to make...
RF Field Strength meter
As I used this probe last night to determine if a 384 MHz oscillator was really working or not, I remembered an email I received a while ago, asking how to make a field strength indicator without the microcontroller. Thus...
IR Remote Control Extender Circuit (Mark 2)
This is an improved IR remote control extender circuit. It has high noise immunity, is resistant to ambient and reflected light and has an increased range from remote control to the extender circuit of about 7 meters. It should work...