Advertisement
Tunnel Diode Oscillator – Circuit Schematic
Tunnel Diode Oscillator
The excess small forward current flow in a tunnel or Esaki diode is a manifestation of quantum mechanical tunneling....
Signal Generator 20KHz – Circuit Schematic
Signal Generator 20KHz
This fucntion gernerator IC is specified to work to 20 MHz. So far, this unit works nicely to 50KHz. Since I seldom need signals higher than that, it has taken ...
Function Generator Sine / Triangle / Square / Saw ( PIC16F870 ) – Circuit Schematic
Function Generator Sine / Triangle / Square / Saw ( PIC16F870 )
After the recent demise of our multifunction signal generator, we decided to make one of our own. The circuit uses a PIC16F870 (about $3), an R/2R resistor la...
Simple Toy Organ using 555 – Circuit Schematic
Simple Toy Organ using 555
This is a simple oscillator with multiple resistors in serie. When you press any switch, the circuit starts oscillating. You can user variable resistors instead...
HF GENERATOR using a 68HCx11 – Circuit Schematic
HF GENERATOR using a 68HCx11
The GHF1 is a small generator covering the HF and LF band from 30 Hz to 30 MHz in 6 ranges. The sinusoidal signal obtained can be amplitude modulated (AM) or fr...
Simple VCO with 1 transistor – Circuit Schematic
Simple VCO with 1 transistor
Unijunction transistors are very intresting. They love to be used in oscillators, and it doesn't takes too many part or very much coaxing to get their sawtooth ...
Triple Waveform Generator with 8038 – Circuit Schematic
Triple Waveform Generator with 8038
The Tri-Waveform Generator can be used for a number of different uses. The one that I use it for is a signal generator to test circuits. The frequency range is ...
Direct Digital Synthesis Oscillator – Circuit Schematic
Direct Digital Synthesis Oscillator
The AD9835 combines the Numerical Controlled Oscillator (NCO), COS Look-Up Table, Frequency and Phase Modulators, and a Digital-to-Analog Converter on a single ...
Collection of Crystal Oscillators – Circuit Schematic
Collection of Crystal Oscillators
On following pages circuits are shown for 3rd overtone crystals 15 to 65MHz and 5th overtone crystals 60 to 105 MHz operating in their series resonant mode. In ...
Voltage Controlled Oscillator with BF990A – Circuit Schematic
Voltage Controlled Oscillator with BF990A
The VCO is based on a Hartley oscillator. The frequency is determined by L1 and capacitor C1. The Vtuning voltage will change the capacitance in the varactor BB...
Graphical Waveform Synthesiser – Circuit Schematic
Graphical Waveform Synthesiser
Originally I intended to have 32 faders. Once I tried fitting them on a veroboard, 32 seemed rather excessive so I have reduced to sixteen. This still allows ge...
Function Oscillator Generator (MAX038) – Circuit Schematic
Function Oscillator Generator (MAX038)
Oscillation frequency 10Hz ~ 20MHz, 6 ranges. Analog output Sine, triangle, square wave (0 ~ 4Vp-p, Zo = 50?). TTL Output Clock (Duty: 50% fixed) positive negat...
Chua's Oscillator circuit – Circuit Schematic
Chua's Oscillator circuit
The applet shows a simulation of Chua's circuit, plotting the voltage measured across C1 against the voltage measured across C2. This corresponds to the display...
pest repellent circuit – Circuit Schematic
pest repellent circuit
It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range of 30 kHz to 50 kHz. Human beings can't hear these high-frequen...
Mosquito repelant circuit – Circuit Schematic
Mosquito repelant circuit
The Astable Multivibrator, which is generally used as a signal generator, is once again used here to generate the desired frequencies. It is an excellent exampl...
Sawtooth to triangle converter for oscillator – Circuit Schematic
Sawtooth to triangle converter for oscillator
This wave shaper needs an input saw that goes from Vss to (ideally) Vdd. It works well with the 4069 VCO designed by Ren? Schmitz. Any saw will work as long as ...
Negative Resistance Oscillator with Tunnel Diode – Circuit Schematic
Negative Resistance Oscillator with Tunnel Diode
This circuit can be easily powered from a 1.5 volt battery. One characteristic of N type negative resistance devices is that they typically require a very low b...
Tone generator with 555 – Circuit Schematic
Tone generator with 555
This circuit is based around the 555 timer circuit, used as an astable (free running) oscillator. The frequency (pitch) of the tone is set by the resistors and ...
100 MHz RF oscillator with ATtiny12 – Circuit Schematic
100 MHz RF oscillator with ATtiny12
A frequency reference for tuning up the RS-232 to 100 MHz RF desktop channel adapter elsewhere on this site, when I found this Saronix crystal oscillator in my ...
16-300 MHz Testing Colpitts oscillator – Circuit Schematic
16-300 MHz Testing Colpitts oscillator
The circuit is a modified Colpitts oscillator, tuned with MV209 varactor diodes. The resonating inductor and the drain choke are selected by a rotary switch. 1...