little rc boat
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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,...
Wireless Car AlarmCircuit With 2N3904 Transistor
The following circuit illustrates a Wireless Car Alarm Circuit Schematic Diagram. Features include the ability to detect sounds within a 20-meter radius, a 1/16 wavelength antenna, and the capability to transmit radio signals up to 2 kilometers. Q1 serves as...
ic transmitter
FM transmitter IC manufacturers and suppliers include FM transmitter IC manufacturers with Bluetooth capabilities. The FM transmitter features an integrated circuit with four channels. The TNA029 IR audio transmitter IC is a low-cost solution with high performance.
The FM transmitter integrated...
The eight-way remote control circuit diagram composed of module
This is an eight-way signal remote control selection circuit composed of ZHJ-9904. It includes a remote control transmitter circuit, an eight-way switch control circuit, and a remote control transmitter.
The eight-way signal remote control selection circuit utilizing the ZHJ-9904 is designed...
Replacing Motorola Batteries
The battery packs were approximately $60 per pair, including a charger and batteries, and feature a three-bar battery gauge. Through experimentation, it was found that a voltage greater than 4.28V activates all three bars, while a voltage above 3.47V activates...
Circuit diagramms of the 144 SBB/RX - Receiver
To comprehend the interconnections between the following circuits, it is essential to first review the concept chapter. It is at the discretion of the user to select one or two of these circuits for personal development. The discussion begins with...
How to build a simple remote control system
Due to the huge interest in this project, I have just recently finished the NEW schematics. The older schematics were scanned and pretty poor quality. These new ones should make it considerably easier to recognize the parts used for the...
Receiver monitor
The alarm connects to the earphone jack on a receiver. When a signal, typically sent to the headphones, is detected and applied to the gate of SCR1, it conducts, activating the alarm connected to SOI. The signaling device can be...
ATV JR TRANSMITTER 440 MHz
This low-power video transmitter is suitable for remote control applications, surveillance, or amateur radio. It employs seven transistors within a crystal oscillator multiplier RF power amplifier chain, along with a high-level video modulator. A supply voltage ranging from 9 to...