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Crystal oscillator-doubler – Circuit Schematic
Crystal oscillator-doubler
The crystal operates into a complex load at series resonance. Ll, Cl, and C2 balance the crystal at zero reactance. Capacitor Cl fine-tunes the center frequency...
Crystal oscillator – Circuit Schematic
Crystal oscillator
The crystal is in a feedback circuit from collector to base. A trimmer capacitor in series shifts the point on the reactance curve where the crystal operates, t...
Overtone oscillator with crystal switching – Circuit Schematic
Overtone oscillator with crystal switching
The large inductive phase shift of LI is compensated for by Cl...
Crystal controlled butler oscillator – Circuit Schematic
Crystal controlled butler oscillator
A typical Butler oscillator (20-100 MHz) uses an FET in the second stage; the circuit is not reliable with two bipolars. Sometimes two FETs are used...
Fifth-overtone oscillator – Circuit Schematic
Fifth-overtone oscillator
This circuit isolates the crystal from the dc base supply with an rf choke...
Schmitt trigger crystal oscillator – Circuit Schematic
Schmitt trigger crystal oscillator
A Schmitt trigger provides good squaring of the output...
Overtone crystal oscillator – Circuit Schematic
Overtone crystal oscillator
This design is for high reliability over a wide temperature range using fifth and seventh overtone crystals. The inductor in parallel with the crystal causes an...
96Mhz crystal oscillator – Circuit Schematic
96Mhz crystal oscillator
Stable VXO using 6- or 8-MHz crystals uses a capacitor and an inductor to achieve frequency pulling...
Simple ttl crystal oscillator – Circuit Schematic
Simple ttl crystal oscillator
This simple and cheap crystal oscillator comprises one third of a 7404, four resistors and a crystal. The inverters are biased into their linear regions by R1 t...
96Mhz crystal oscillator – Circuit Schematic
96Mhz crystal oscillator
By using a crystal between 27 and 33 MHz, the 3rd harmonic will deliver between...
Crystal checker – Circuit Schematic
Crystal checker
Use this circuit for checking fundamental oscillates, Q2 conducts and the LED lights. A3 HF crystals on a "Go-No-Go" basis. An untuned or 6V, 40mA bulb could be...
Overtone crystal oscillator – Circuit Schematic
Overtone crystal oscillator
The crystal element in this circuit is connected directly between the base and ground. Capacitor Cl is used to improve the feedback due to the internal capacita...
Overtone crystal oscillator – Circuit Schematic
Overtone crystal oscillator
This circuit employs an adjustable resonant tank circuit which insures operation at the desired crystal overtone. Cl and LI form the resonant tank circuit, whic...
High frequency crystal oscillator – Circuit Schematic
High frequency crystal oscillator
One section of the MC10101 is connected as a 100 MHz crystal oscillator with the crystal in series with the feedback loop. The LC tank circuit tunes the 100 MHz...
Wide range oscillator – Circuit Schematic
Wide range oscillator
Timing resistor R may be adjusted to any value between 10 K and 50 M to obtain a frequency range from 400 kHz to 100 Hz. Returning the timing resistor to the co...
Tunable single comparator oscillator – Circuit Schematic
Tunable single comparator oscillator
Varying the amount of this comparator circuit"s hysteresis makes it possible to vary output frequencies in the 740-Hz to 2-kHz range smoothly...
800 Hz oscillator – Circuit Schematic
800 Hz oscillator
The following transistors may be used: HEP-254, OC-2, SK-3004, AT30H...
Phase shift oscillator – Circuit Schematic
Phase shift oscillator
A single transistor makes a simple phase shift oscillator. The output is a sine wave with distortion of about 104. The sine wave purity can be increased by putt...
Feedback oscillator – Circuit Schematic
Feedback oscillator
Circuit oscillates because the transistor shifts the phase of the signal 180° from the base to the collector. Each of the RC networks in the circuit is desig...
Phase-shift oscillator – Circuit Schematic
Phase-shift oscillator
Circuit uses a simple RC network to produce an exceptionally shrill tone from a miniature speaker. With the parts values shown, the circuit oscillates at a freq...