TC9400 Wide Frequency Range Pulse Generator

The reason why TC9400 V/F converter is very useful in the laboratory are because it’s portable, battery-operated, and low cost frequency source. Both pulse and square-wave outputs are provided by the TC9400. A triangular waveform can also be generated by adding an op-amp integrator. The outputs can be frequency-modulated via the FM input. [Circuit’s schematic diagram source: Microchip Application Note]

Read more

Pulse Delay Generator

This circuit is a Delayed Pulse Generator that is used to provide pulse rate and independent control of initial delay. The pulse generator of this circuit is IC1c which the operation is depended onĀ  the normally low O/P of the IC1a. The PB1 is used to make the circuit input goes low. When PB1 is pressed, IC1b O/P goes high […]

Read more

Voltage Controlled Oscillator with Varactor

This is a Voltage Controlled OscillatorĀ  (VCO) circuit. This circuit is based on Hartley oscillator. The frequency depend on the value of C1 and L1. The oscillation-frequency will change as the change of the capacitance in the varactor BB132 by The Vtuning voltage. The maximum frequency that can be changed is determined by th value of C2. For large frequency […]

Read more

Frequency Source with Digital Control

This is a frequency source system that is controlled by a digital (microprocessor/microcontroller) system. This circuit producesĀ  a square wave signal with adjustable frequencies. Here is the block diagram of digitally controlled frequency source system: This frequencies are controlled by microcontroller register, counter or thumb-wheel switches. This system can be used in many applications like numerically-controlled machine tools and computer-controlled […]

Read more

Single Gate Relaxation Oscillator

Below is a relaxation oscillator circuit using a 74HC14, an inverter with a Schmitt trigger input. It’s mean that the transition point for an increasing input is higher in voltage than the transition point for a decreasing input. The difference is called the “hysteresis.” Such an input is very useful for a slowly-varying inout or one with noise. The opposite […]

Read more
1 2 3 4 8