VHF Dip Meter circuit
Basic Circuits
This is a simple VHF dip meter circuit.The DIP meter is the frequency meter by use the LC resonance circuit that adjustable until the frequency show peak amplitude. The circuit include variable frequency generator circuit, rectifier and a moving coil meter. In the oscillator include two transistors T1 and T2. The tuning circuit include C1 and coil Lx this coil will is outside the metal box. When apply the power to circuit, the voltage from the oscillator will be rectifier by diodes D1 and capacitor C2. Then, send signal to P1 that use to adjust meter. If bring the coil …
The Filter circuit for the Scratch and Rumble Noise
RF - Oscillator
If a friend gets into trouble about the noise. Try out this circuit before, may like. It is Filter the Scratch and Rumble Noise Circuit. That make a friend feels annoyed very the character of the circuit filters this frequency , use , Resistor , and , Capacitors , or , RC Filter that often call that Passive Filter Circuit. By have Switch choose filter the noise. By SW1 for Rumble noise Filter and the SW2 for Scratch noise filter. Make the noise that change this circuit goes to are left a little for power supply Source should use battery …
Band rejection filter circuit using TL071
RF - Oscillator
The band rejection filter circuit is not wide filter that can denial the frequency up to 60dB by we used the TL071 single chip op-amp it is very low distortion and work good at output to maximum to 100kHz or the range 1Hz to 20kHz In the circuit we defined three resistors R1,R2,R3 are like value to 100K, and then two capacitors C1,C2 are equal to 330pF, For will reject the frequency at 50Hz. By we can select the parts with the formula is F = 2×3.14xRC , And to get rejection well than 40dB if we should the resistor …
Sine wave oscillator low frequency-constant amplitude
Basic Circuits
In the Sine wave oscillator circuit often to be use the thermistor and Incandescent lamp, for upset the output of circuit has fixed value, the resistance of the thermistor dependent on temperature and as a result to voltage drop across of it. From the slow response of the thermistor make to properties of temperature against resistance is not linear like with that do not distortion value in this oscillator circuit. In this circuit, we use a zener diode in performs this function instead by is used to limit a voltage. Then, the bridge circuit consisting of R1, R2 and C1, …