Whats a good square wave generator circuit

Is it possible to build an oscillator (VCO or not) without using a crystal? I built a Pixie II with a borrowed crystal, which I have since returned, and now I am inquiring about the feasibility of constructing an oscillator...

Digital Roulette with Display circuit

This circuit is a small digital roulette. It consists of an oscillator IC1, a counter IC2, and transistors Q1-7 that drive the common cathode display DSP1. The power supply typically comes from a 9V battery, but it can also be...

20Hz signal generator (phone-ringing) circuit diagram

The circuit described is a 20Hz signal generator suitable for telephone ringing systems, alarm systems, and various other electronic applications. It consists of a transformer (T) and two transistors (VT1 and VT2), forming a push-pull oscillator. The two transistors operate...

The door bell circuit

Figure 1 illustrates an economical and straightforward Gate Alarm designed to operate using a small universal AC-DC power supply. IC1a functions as a fast oscillator, while IC1b serves as a slow oscillator. These two oscillators are integrated through IC1c to...

DIY Homemade Signal Generator with Pulse Width Modulation

Construct a signal generator using readily available components. It should produce a square wave with variable frequency and adjustable pulse width. This device can be utilized for various applications, including DC motor speed regulation, dimming of lamps or LEDs, transformer...

pills reminder schematics

The clock circuit is constructed using a stable oscillator that consists of two inverters integrated into IC1 and a watch crystal that oscillates at 32.768 kHz. This frequency is divided by 16384 through the internal flip-flop chain of IC1, resulting...

Colpitts oscillator FM transmitter

Its frequency depends on the capacitance of the vary cap diode. The center frequency is changed by varying the biasing voltage of the vary cap through the 47K pot. You can use a 75cm telescopic antenna or simply a length...

Metal detector circuit diagram 1

The metal detector circuit includes a fixed frequency oscillator, mixer, detector, detection oscillator, and power amplifier circuit. The fixed frequency oscillator circuit is composed of a ceramic filter (ZC), transistor (V1), resistors (R1 to R4), capacitor (C2), and other components....

Square Wave Generator (For Resonant Air-Gap Transformer)

A new project has been selected for the upcoming year, which is an improvement over the previous project, a homemade x-ray machine. The chosen project involves developing a safer and more efficient electronic device, replacing the homemade x-ray machine that posed...