Sweep/Function Generator
Maxim's MAX038 function generator chip is capable of producing nearly constant amplitude sine, square, and triangle waves with a low output impedance, from a ve...
4 MHz Modulated Oscillator (2N4401)
This circuit generates a low power test signal and should not be used as a transmitter. Make sure you are within the law in the locality in which you operate th...
LED Crystal Tester
Transistor Q1, a 2N3563, and its associated components form an oscillator circuit that will oscillate if, and only if, a good crystal is connected to the test ...
LED Crystal Tester
Transistor Q1, a 2N3563, and its associated components form an oscillator circuit that will oscillate if, and only if, a good crystal is connected to the test ...
Frequency Sine wave generator with MAX083
This circuit uses the versatile MAX038 function generator. Although in this circuit some of the advanced characteristics of this IC are disabled, you can genera...
Simple Wien-Bridge Oscillator
Incandescent lamp has been used to reduce harmonic distortion in sine oscillator circuit. The nonlinear resistance characteristic of the lamp filament help the ...
RF oscillator circuit (2N3904)
This basic RF oscillator circuit is easy to build and the components are not critical. Most of them can be found in your junk parts box.
The L1 antenna col c...
Astable Multivibrator with 2 Transistors
This circuit is basically simple and easy to build, it uses two transistors as active components and a few passive components like resistors, capacitors and two...
Clock circuit using SX 28 internal oscillator
The SX 28 internal oscillator Is not that fast so an external oscillator can be hooked up to the processor as shown in the diagram to increase the operation cyc...
Bedini Circuit
The power is all in the timed switching process. There are two main principles I use of switching the radiant energy the John Bedini way. First, the SG/SSG, Ice...
FUNCTION GENERATOR
The circuit has both square-wave and triangle-wave output. The left section is similar in function to a comparator circuit that uses positive feedback for hyst...
Buffered Crystal VXO
The circuit is an VXO with buffered output. It operates on 20-meter amateur radio band with the output voltage about 0.2 Vp-p.
The crystal frequency is pulled ...
2N2222 Crystal Oscillator
This crystal oscillator is designed to operate with fundamental crystals with less than 1 mW dissipated in the crystal. The signal current is filtered by the cr...
Simple Crystal Tester
This is a simple XTal tester circuit. T1 and XTal have formed an oscillator. C1 and C2 are voltage divider for oscillator. if the XTal is safe, the oscillator w...
Waveform Generator with ICL 8038CCPD
That circuit is based on a 14-pin DIL IC capable of producing sine, square, triangular, sawtooth and pulse waveforms of high accuracy and stability. The frequen...
flyback with a pulsed DC signal
A 555 is used as an oscillator, optimally around 15.76KHz (in North America). Power pins on the chip (pin 1 to ground, pin 8 to +12V) are not shown on the diagr...
Relaxation box
This box is a set of nine relaxation oscillators. It blinks random patterns and looks cool. When the voltage on the capacitors charge to 65 volts, the neon gas ...
CW Sidetone Generator
This circuit is about as good as it gets for generating morse code tones. It may be used as a code practice oscillator, a tone generator for a keyer, a sidetone...
Precision Metronome/Pitch
Precision Frequency generator 1 to 999 Hz
Precision Metronome 1 to 999 beats per minute. CMos IC1 and IC2B quad AND gate form a 2.4576 MHz crystal oscillator p...
Tone Generator with 555
this tone generator can be used to control your robot. you will need to use the tone decoder for this. to widen the range, higher or lower - substitute a higher...