Free Simple Circuit Diagram
Using this circuit, we can accept positive or negative or differential control voltages. When the control voltage is zero, the output frequency is zero. To charge the timing capacitor C1 linearly, the 741 op amp forms a current source controlled by the voltage EC. The capacitor charges and discharges between 1/3 Vcc and 2/3 Vcc because NE555 is connected in […]
Read more
Voltage-to-frequency converter (VFC) circuit is shown in the schematic diagram below. The circuit employs 555 IC as the core of its function. This circuit uses +5V and -5V supply voltages, and the input is limited to 0-2V. You can adjust the zero point by grounding the input and adjust the 4k7 pot to obtain the lowest frequency oscillation. [Circuit’s schematic […]
Read more
Precision oscillator can be built using quartz crystal, but with proper component selection, you can also build one with RC (resistor and capacitor) circuit. Not only to build a tone/frequency decoder, 567 IC can be used to build such oscillator as well. The good news is that you need only few components, and a VCO terminal to fine tune the […]
Read more
This is a schematic diagram of a micropower voltage-controlled oscillator circuit. This circuit can generate square and triangle wave outputs and only need 50µA from a single 5 V supply. This circuit consist of combination of an inexpensive quad CMOS switch and two OP90s. Here is schematic diagram of the the circuit : The integrator in this circuit is A1. […]
Read more