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VHF Overtone Oscillator – Circuit Schematic
VHF Overtone Oscillator
VHF overtone crystals can be difficult to use due to the many frequencies at which the crystal is perfectly happy to oscillate. A typical 100 MHz, 5th-overtone ...
Noise making circuits – Circuit Schematic
Noise making circuits
The heart of the circuit is the two transistor flasher with frequency modulation applied to the base of the first transistor. When the pushbutton is depressed, ...
Astable Flip-flops – Circuit Schematic
Astable Flip-flops
The familiar astable flip-flop circuit is a handy configuration for making flashers or generating squarewaves. Here is a typical alternating LED flasher with th...
Flasher Circuits – Circuit Schematic
Flasher Circuits
The basic two-transistor flasher shown below has found its way into dozens of applications due to its simplicity and versatility. Applications have included suc...
Audio Oscillators – Circuit Schematic
Audio Oscillators
A phase-shift audio oscillator with excellent distortion characteristics thanks to "softened" diode limiting provided by the 1N914 and resistor divider and dege...
Schumann Resonance Converter – Circuit Schematic
Schumann Resonance Converter
Using a similar circuit to the LF block converter, I`ve made a Schumann Resonance Converter that moves the near-DC signals up to around 2 kHz for an ordinary so...
Astable Multivibrator – Circuit Schematic
Astable Multivibrator
This is an Astable Multivibrator Circuit to alternately flash two LEDs. The R and C Values determine the frequency and the 470 ohm collector load resistors set ...
Square Wave Oscillator – Circuit Schematic
Square Wave Oscillator
It`s most useful application is as a Signal Injector for radios and TV`s. A square wave is the most suitable for testing the IF (Intermediate Frequency) strip a...
16 Step Analog Sequencer circuit – Circuit Schematic
16 Step Analog Sequencer circuit
The following video is of my test circuit of a 16 step analog sequencer based on Mauno Tuominen`s schematic for an analog CMOS sequencer based around at 4067n m...
The FV-1 Crystal Oscillator – Circuit Schematic
The FV-1 Crystal Oscillator
The Fv-1 has internal circuitry to support an external crystal, preferably a 32768Hz watch crystal. These crystals are extremely inexpensive and widely availabl...
A low noise four phase crystal oscillator – Circuit Schematic
A low noise four phase crystal oscillator
A 10 MHz crystal is typically 4 ohms at its series resonance and 40 kiloohms at its parallell resonance. To get low sideband noise the power dissipated in the c...
The local oscillator for 10.7 to 2.5MHz conversion – Circuit Schematic
The local oscillator for 10.7 to 2.5MHz conversion
A 52 MHz third overtone crystal is typically 30 ohms at its series resonance according to manufacturer specifications. The crystals used for the prototypes have...
Basic RF Oscillator – Circuit Schematic
Basic RF Oscillator
Make a basic RF oscillator. The circuit is ridiculously simple, so I will skip all the complicated maths and make component selection simple by using calculator...
A Low-Frequency Crystal Controlled Oscillator – Circuit Schematic
A Low-Frequency Crystal Controlled Oscillator
The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of e...
DUAL TESLA COIL – Circuit Schematic
DUAL TESLA COIL
This area shows the construction and testing of a new half-wave (dual) Tesla coil. This type of coil has two secondaries driven by a single tank circuit. The de...
Multivibrator – Circuit Schematic
Multivibrator
Multivibrators are two-state (high or low) output circuits. These include oscillators, timers and flip-flops. Multivibrators are mostly used in applications whi...
Simple Ultrasonic Wave Generator – Circuit Schematic
Simple Ultrasonic Wave Generator
Ultrasonic sound wave can be generated using electronic circuit. This simple electronic circuit can generate an ultrasonic wave with frequency range of 12 to.....
Frequency Modulated Oscillator (for FM Transmitter) – Circuit Schematic
Frequency Modulated Oscillator (for FM Transmitter)
An oscillator can be built using LC (inductor-capacitor) tank circuit. When we vary the capacity of the capacitor in LC tank circuit then the frequency of the.....
Voltage to Frequency Converter Using UJT – Circuit Schematic
Voltage to Frequency Converter Using UJT
The following voltage to frequency converter (V/FC - VCO) circuit consist of a UJT (uni-junction transistor) oscillator in which the timing charge capacitor C2....
Triangle Waveform Signal Generator – Circuit Schematic
Triangle Waveform Signal Generator
A symmetrical, mV peak to peak triangle waveform can be generated by the circuit depicted in the following schematic diagram. This circuit is featured with.....