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Precision Crystal Frequency Checker – Circuit Schematic
Precision Crystal Frequency Checker
This circuit uses a Colpitts oscillator (Ql) with a buffer amplifier (Q2) to test crystals. SI selects ...
455Khz Am IF Signal Generator – Circuit Schematic
455Khz Am IF Signal Generator
An MPF102 FET oscillator drives a dual-gate MOSFET buffer. The MPF102 is configured as a Hartley oscillator....
Fm Generator – Circuit Schematic
Fm Generator
The internal zener on pin 15 of the 4046B supplies a stable voltage to the 3140IC op amp. This amplifier modulates the 4046B V...
Function Generator – Circuit Schematic
Function Generator
Using an Intersil ICL8038, this function generator generates frequencies from 1 Hz to over 80 kHz. Rl is the fine freque...
Audio Function Generator – Circuit Schematic
Audio Function Generator
Using an EXAR XR2206, this generator will produce sine, square, and triangular waves from 10 Hz to 100 kHz. Ul is ...
Frequency/Voltage Converter – Circuit Schematic
Frequency/Voltage Converter
Teledyne Semiconductor"s Type TSC9402 is a versatile IC. Not only can it convert voltage into frequency, but al...
1000:1 Tuning Voltage-Controlled Filter – Circuit Schematic
1000:1 Tuning Voltage-Controlled Filter
A standard dual integrator filter can be constructed using a few CA3080s. By varying LABC, the reso...
Low-Frequency Prescaler – Circuit Schematic
Low-Frequency Prescaler
For multiplying frequencies in the 1-to 150-Hz range, this circuit uses a 4046B and a 100 prescaler. The VCO output...
Crystal Oscillator – Circuit Schematic
Crystal Oscillator
This simple circuit will oscillate with a wide range of crystals. Connect several different types of crystal holders in ...
Economical Crystal Time Base – Circuit Schematic
Economical Crystal Time Base
The above time base circuit will provide 50-, 100-, or 200-Hz signals from an inexpensive crystal cut for 3.27...
150 To 30000Khz Oscillator – Circuit Schematic
150 To 30000Khz Oscillator
CI capacitor in series with the crystal may be used to adjust the output frequency of the oscillator. The valu...
330Mhz Crystal Oscillator – Circuit Schematic
330Mhz Crystal Oscillator
A /xPC 1651G IC operates in the fundamental mode with an experimental crystal at 330 MHz. The 56-to-270 pF capac...
100Mhz Overtone Oscillator – Circuit Schematic
100Mhz Overtone Oscillator
This oscillator circuit uses a 5th overtone crystal in the 85-to-106 MHz range. Y1 is the crystal. The circuit ...
100Khz Crystal Calibrator – Circuit Schematic
100Khz Crystal Calibrator
Using a 12-V supply, this crystal calibrator should prove a useful accessory for a SW receiver. Ql and Q2 form a...
Colpitts 1 To 20Mhz Crystal Oscillator – Circuit Schematic
Colpitts 1 To 20Mhz Crystal Oscillator
This is a simpie Colpitis crystal oscillator for 1 to 20 MHz, can be easily made from junk-box part...
Micropower Clock – Circuit Schematic
Micropower Clock
Although ceramic resonators are a good choice for low-power, low-frequency clock sources (if you can stand their 30-ppm te...
Rectangular/Triangular Waveform Converter – Circuit Schematic
Rectangular/Triangular Waveform Converter
Many function generators are based on a rectangular waveform generator that consists of a Schmitt...
Sawtooth Converter – Circuit Schematic
Sawtooth Converter
Simple function generators normally provide sinusoidal, rectangular, and triangular waveforms, but seldom a sawtooth. Th...
Oscillator Buffers – Circuit Schematic
Oscillator Buffers
CMOS buffers added to an op amp oscillator improve performance, largely as a result of nonsymmetry and variability of th...
Voltage·to-frequency-converter – Circuit Schematic
Voltage·to-frequency-converter
This circuit consists of a UJT oscillator in which the timing charge capacitor C2 is linearly dependent on the input sigoal voltage. The charging current is se...