Chime Circuit with 4049
Resistor R1, capacitor C1, and two converters form a square wave generator, which produces the basic tone. The generator is sui followed by an inverter which se...
Simple Staircase Generator
U2 is a decade counter /divider, Ul is used as a switch debouncer. For a self-generating system, connect a resisor...
Function-generator
This generator will supply sine, triangular, and square waves from 2Hz to 20kHz. This complete test instrument can be plugged into a standard 110 Vac line for ...
Wien bridge oscillator schematic
This is a simple scheme for whom a bridge oscillator. It provides a nice sinusoidal signal. This type of oscillator uses an op-amp. The weakening of the oscilla...
Astable multivibrator with two LED
This is one of the basic circuitry of the electronics. The multivibrator astabiele shows two LEDs alternately light up with an adjustable speed. The circuit use...
Quartz Crystal Windup Wall Clock
Last year, I found a 31 day pendulum wall clock (dissambled) in a box of parts at a swap meet and decided to try and put it together and regulate it with a quar...
Wien Bridge RC Sinewave Oscillator
Three examples of Wien Bridge oscillators are shown below. The first uses three bipolar transistors. The second uses a bipolar and JFET, and the third is the mo...
Triangle / Squarewave Oscillator
Here is a simple triangle/squarewave generator using a common 1458 dual op-amp that can be used from very low frequencies to about 10 Khz. The time interval for...
Sinewave Generator schematics
The two circuits below illustrate generating low frequency sinewaves by shifting the phase of the signal through an RC network so that oscillation occurs where ...
Oscillator using crystal
Below are a couple circuits you can use to produce a 32.768 KHz square wave from a common watch crystal. The output can be fed to a 15 stage binary counter to o...
Crystal Oscillator counter
Using a 50 Khz crystal, a count of 50000 is detected when the appropriate counter bits that add up to 50000 are all high. This corresponds to bits 15 (32768) + ...
Tone Oscillator with 555
This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker. In the circuit on the left, the speaker is isolated from the oscil...
Suspended Bicore circuit for robots
The bicore is the basis of advanced BEAM! Most intermediate to advanced BEAM robots are built off of the bicore. Uses go all the way from photovores to servo mo...
1 KHz Audio Oscillator schematic
This circuit consists of a CMOS square wave oscillator on a frequency of approximately 1 kHz. The RC filter, which has a roll-off frequency of 500 Hz, filters t...
Flyback Transformer circuit with 555
The 555 is wired as an astable and the capacitor is charged only through the 4,7Kohm trimmer (notice the diode) and discharged only through the 2.2 Kohm trimmer...
Astable multivibrator circuits
What exactly is a multivibrator? I suppose one definition would be 'a circuit which has several states'. This will do for now, it's quite loose so leaves plenty...
Tesla Coil using 555
Single transistor flyback driver caused many problems due to it's operating principle. I received e-mails from people who were unable to get it functional even...
Audio Oscillator schematic
The oscillator circuit (see Figure 1) involves two unity gain phase shift stages, A1 and A2, in tandem and a gain stage, A3, with back to back diodes and resist...
Theremin Circuit
Two identical integrated circuits, U1 and U2, known as "hex inverters" are used for the theremin's primary functions. They are CMOS (Complimentary Symmetry Meta...
Sawtooth generator circuit
Sawtooth wave generators using opamp are very common. But the disadvantage is that it requires a bipolar power supply. A sawtooth wave generator can be built us...