Super-regenerative receiver at 433MHz circuit

Here's a way to get a short range bidirectional RF (Radio Frequency) channel on a microcontroller, using the controller's tristatable I/O pins and on-chip comparator with a few passive components. The range with the firmware and simple I came up...

Radio Frequency Circuits

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Single injector-tracer

In the "Trace" mode, the non-linear operation of the amplifier will detect modulated RF signals, which will be filtered by the 0.001 µF capacitor and heard in the headphones. In the "Inject" mode, this circuit will provide a nominal square...

Visual modulation indicator

The brightness of the indicator lamp changes in accordance with the modulated RF signal. Adjust resistor R2 while the transmitter is on (modulated) until the lamp flashes in sync with the modulation. Cl = 5 pF, C2 = 100 pF, Dl...

RF Inductance Meter

This RF inductance meter measures RF chokes in the 500 nH to 50 µH range. A simple solution was required to measure hand-wound RF inductors in a secondary lab setting. The user intended to utilize this device occasionally and did...

turret diy

For maximum mini-security, this RC Tupperware Turret delivers a formidable deterrent against food theft. While it lacks motion sensors, potential food thieves will think twice before attempting to swipe baked goods. This 11-hour project, designed by Chris of PyroElectro, emphasizes...

80M

This 80M receiver design incorporates the necessary switching mechanisms to enable the SSB filter and first intermediate frequency (I.F.) amplifier to function for transmission purposes. The receiver stages, from the radio frequency (R.F.) input to the speaker output, will be...

2 Channels RF remote control

Remote controls are often needed to manage various electric devices. There are several types of remote controls available, including infrared, RF (Radio Frequency), and SMS. Basic short-range remote controls primarily utilize infrared and RF technology. A limitation of infrared is...

Simple Direct Conversion Receiver

A low-cost continuous wave (CW) superheterodyne receiver operates with a 4.00 MHz intermediate frequency. While there is no automatic gain control (AGC) or RF gain control, the receiver demonstrates good large signal handling capabilities. The design incorporates six bipolar transistors...