quartz circuits
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Crystal quartz oscillator
Jan 6th
Another great quartz crystal oscillator schematic with bb139, a 2-nd harmonic quartz crystal and one BF214 transistor. So, the Q quartz is half of the desired transmitter frequency, L1 has 24 turns, 0.08mm Ø built on a 455kHz carcase. L2 has 8-9 turns / 0.8mm Ø / 5mm Ø. This quartz oscillator circuit has a great frequency stability, I’ve build it. Crystal quartz circuit components (more…)
Quartz crystal oscillator
Nov 21st
A very simple crystal quartz oscillator circuit schematic which use a quartz for frequency stability and a good rf tranzistor. Use a 2-nd or 3-rd harmonic crystal , for example if you want 100MHz use a 50MHz or 33.3MHz quartz or if you want use a 4-th harmonic crystal but the output rf voltage will be lower. The L coil has 5 turns 0.8mm Ø , 6mm Ø , 1 mm step, output at first turn from + . Use C4 for fine frequency adjustments. For a great frequency stability, this quartz oscillator circuit must use a good varicape diode (you can use More >
1Hz generator and 2Hertz oscillator
Oct 30th
This 1 Hz and 2Hz generator or oscillator is built with 4060 as an oscillator and a 14 bits counter. To obtain a 1Hz signal after 4060 we use 1/2 4013. This circuit provides a rectangular voltage with a amplitude between 0V and the power supply voltage. To adjust this 1Hz generator connect to pin 9 a frequency meter and adjust C2 untill shows 32,768KHz. (more…)
Quartz oscillator
Sep 18th
This quartz oscillator circuit has greater stability than a parallel resonance circuit. It generates frequencies up to 30 MHz or even higher if you use BFR 91 T1, T2 transistors and reduce R1 … R2 values. The MOSFET buffer insulate the oscillator from any connected circuit. (more…)
High Frequency Generator
Jun 12th
High frequency waveform generator is very useful in electronic experiment and design. This circuit generate sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function. The core of this waveform generator is MAX038. This integrated circuit chip gives complete function to build a waveform generator/function generator. (more…)
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