Radio Control for toy car Schematic Diagram
No description available.
Original 2N2/40 Schematic Diagrams
This section describes the components of the receiver, which includes the post-mixer amplifier, variable crystal filter, intermediate frequency (IF) amplifier, product detector, local oscillator, receiver muting, and audio amplifier. The transmit section features the local oscillator, transmit single balanced mixer,...
RF Actuated Keying Monitor
Sending Morse on a rig without a sidetone is not impossible, but is not particularly pleasant either. This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor...
Wireless controlled Door-bell
The controlling range of the wireless doorbell is 100 meters. The transmitter section is designed around an oscillator transistor (BF194B) T2, which is followed by two transistors (BC148) T1 and T3. Transistor T2 generates a specific radio frequency determined by...
Wireless-video-camera-link
This high-performance video camera link transmits signals from a video camera to a VCR or from a VCR to televisions throughout a home. The initial stage of the RF chain is a crystal-controlled oscillator, Q1, operating at a frequency range...
Receiver for 50 khz optical transmitter
To achieve maximum range, the receiver should be constructed similarly to a radio receiver front end, as the signals received will exhibit comparable frequency components and amplitudes of the photodiode current. The primary limitation on the receiver's performance is the...
Corsair and Commando TXs
This document provides information about the Corsair and Commando Transmitters designed by Dave Martin of WNKR. It outlines the construction of each transmitter and includes examples created by others. The circuit diagram presented illustrates the initial two stages of a...
Simple receiver with microvolt sensitivity
The three-transistor circuit costs less than $10 to build, uses commonly available components, and consumes less than 10 mA from a single 9V battery. By winding coil L1 as shown, the circuit can receive signals in the 5 to 15...
Low Power Wireless Audio Power Amplifier as baby mointor
This appears to be an infrared (IR) transmitter. IR signals do not penetrate walls, and it is assumed that this device is intended for use in a room separate from the one in which the user is located, rendering it...
RF Field Strength Meter Circuit
A sensitive and reliable RF field strength meter is an invaluable instrument in amateur radio and radio-controlled model applications. This field strength meter is utilized to align antennas for optimal gain and to determine the transmission range of radio controllers....