Free Circuit Diagram

With very low harmonic distortion, 2N4416 JFET is suitable to smoothly oscillate in a circuit. On application where low harmonic content is required for a good mixer circuit, JFET local oscillator is very good. Below is the circuit diagram of Low Distortion Oscillator: And here’s the 20 MHz Oscillator Values [...]

LT1206 has been naturally selected as the components for video application since it has suitable bandwidth and output derive capability. This high performance features  is not only suitable for video application, but also make it definitely suitable for audio application. The schematic diagram shows the LT1206 combined with the LT1115 low [...]

Using a single supply quad comparator LM339, LM239, LM2901, LM2901V, NCV2901, or MC3302, we can build a square-wave oscillator with simple circuit and formula. Here is the schematic diagram: This circuit is suitable if you need  many square-wave oscillators in one circuit, since the quad packaged comparator provide four comparators in one single  [...]

The excellent high input impedance, high slew rate, and high voltage qualities of CA3140 op-amp make it suitable for Wien-bridge sine wave oscillator. The basic circuit for Wien-bridge sine wave oscillator is shown in the figure below (the upper part). You can see the formula in the figure, when R1=R2=R, and C1=C2=C, then the formula [...]

This is a Colpitts-crystal oscillator circuit. It is suitable for low frequency crystal oscillator circuits. Using the 2N3823 JFET, this circuit has excellent stability because the temperature will not vary the 2N3823 JFET circuit loading. Here is the circuit : [Source: National Semiconductor Application Note]

LM386 is one of my favorite small audio amplifier integrated circuit chip. The LM386 is a power amplifier designed for use in low voltage consumer applications. The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The gain is internally set to 20 to keep external part count low, [...]