heads or tails

The receiver is constructed on a single-sided printed circuit board measuring 2 by 4.3 inches. Its compact size allows for installation in various enclosures, which should be adequately shielded. The main directional signal is captured by a tuned ferrite...

This circuit consists of a single transistor functioning as an amplifier, providing significant amplification for weak and unipolar signals, which can then be fed into a more powerful amplifier. The described circuit utilizes a single transistor in a common-emitter...

A speaker, microphone, and transmit button circuit designed for the Puxing 777 radio, which is likely compatible with all Puxing radios. The circuit was reverse-engineered from an earphone/microphone headset that originally accompanied the radio to understand its functionality. The...

The excavator is a Mitsubishi MS280. The issue at hand is uncertainty regarding the excitation of the pump. The intention is to install an electronic proportional control valve in the machine. The levers are connected via mechanical linkage to...

Adrian Bontenbal has provided updated notes from his experiments in recreating Clara Rockmore's theremin. Bob Moog shared his hand-drawn schematic for Clara's instrument over a decade ago. Adrian started with that schematic to build his own Rockmore theremin. During...

This circuit is designed to electronically simulate the tossing of a coin using a 4049 hex inverter integrated circuit (IC). It employs two of these ICs, specifically IC1a and IC1b, which are configured as an astable oscillator. This configuration...