Antenna Positioning and Drive Circuits
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Armstrong Oscillator
The Armstrong oscillator is utilized to generate a sine-wave output with a constant amplitude and fairly stable frequency within the RF range. It is commonly employed as a local oscillator in receivers, as a source in signal generators, and as...
2 channel RF remote control
The basic small-range remote controls are Infrared and RF (Radio Frequency). One of the weaknesses of Infrared is that the signal cannot pass through walls. Therefore, to control a garage door, an RF remote control is necessary. The circuit (transmitter...
Road remote control switch production
The production of this wireless remote control switch is relatively straightforward. All component parameters have been tested and verified. The installation of the reader component parameters can be completed during production, including the soldering of resistive and capacitive components onto...
LED RF Signal Strength Meter
RF Signal Strength Meter circuits are popular RF measurement devices. This circuit is one of the simplest but very useful circuits that satisfies your desired accuracy. The heart of measurement is high accuracy but easy to use Logarithmic Detector AD8313...
Cyclotron II
The white feedthroughs are for connecting the RF high voltage to the D's (not shown). The copper pipe perpendicular to the main pipe serves as the vacuum line. The D's are equipped with screw posts on the side for connecting...
making of wireless car
This document explains how to create a wireless car using integrated circuits (ICs) and requires additional components such as registers. It is recommended to visit an electronics shop to purchase a wireless car kit operating at 413 MHz ASK type,...
Garage door open indicator
There are battery-powered wireless systems available, but the ones encountered would indicate that the door was open even if it was left ajar for ventilation. A system was desired that would alert when the door was fully raised. Additionally, it...
wireless digital code lock with a status display
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One Receiver
RF Cafe visitor David M. requested the scanning and posting of an article from the January 1963 edition of Popular Electronics, authored by Philip Hatfield from the Receiving Tube Department of General Electric. The article describes a straightforward design utilizing...