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Archive for the ‘Oscillator’ Category


More circuits about oscillator, pulse, frequency , and others.


 Hum Filter using electronic coil

Wednesday, November 19th, 2014

There are many ways to filter the hum noise from AC line (50 Hz) from audio signal away. A frequency filter usage is a simple ways that include RLC as the electronic coil. In Figure 1 is the specific frequencies filter. Figure 1 the simple specific frequencies filter using RLC If thoroughly consider to see […]


 Symmetrical Harmonic Oscillator circuit.

Monday, November 10th, 2014

This is the Symmetrical Harmonic Oscillator by the harmonic 3 that without tuning circuit because normal circuit use harmonic frequency always has the tuning frequency circuit. This is Astable multivibrator Oscillator circuit that has the crystal across between both emitter lead of transistors(BF494). The 40pF trimmer capacitor-C5 is connected with crystal to adjust the fundamental […]


 Digital logarithmic sweep signal generator circuit

Wednesday, October 22nd, 2014

This is a Digital logarithmic sweep signal generator circuit by use the average digital, It is designed to use together with the frequency generator by voltage controller. How it works From the circuit in figure 1 is the 14-bit binary counter circuit, that input is synced with the output of oscillator generator circuit. Then, the […]


 Automatic duty factor controlled circuit

Saturday, October 11th, 2014

We can use the schmitt trigger to generate the simple square wave. The duty factor of output waveform will be determined by the input waveform. But the threshold level is the importance. In Figure 1 will have the output while input waveform as Figure 2 cannot have output. Figure 1 Automatic duty factor controlled circuit […]


 Cheapest signal cleaner circuit

Monday, September 29th, 2014

Here is the simple low noise filter circuit for any FSK signals that weak and have noise. This use few parts so easy and cheap. Fig 1: The schematic of this project As Figure 1 is the schematic diagram. This circuit include the low filter circuit through R1 and C2, the frequency cut off at […]


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