Category «RF and Video»

2 Transistors Mini MW Transmitter

This is a Mini MW (Medium Wave) Transmitter circuit. This circuit consist of combination of transistors SA103 and SA101. Those transistors is used as oscillator and modulation signal amplifier. Here is the schematic diagram of the circuit: The transistor is of germanium type, but I think you can replace it with silicon type from the …

VHF-UHF Antenna Amplifier (Booster) 40-500MHz

This amplifier has VHF (very high frequency) and UHF (ultra high frequency) response, you can use it for receiver booster for example. Here is the schematic diagram of the circuit: The current consumption is very low, under 20 mA for 14V voltage supply.¬† Lower current consumption can be achieved if we use 10V power supply, …

Automatic AF-RF Probe

Using this automatic probe, you can see measure both audio signal¬† (AF) and radio signal (RF). If audio signal is being measured, the path of the signal is via C1. Audio signal can’t pass the C2 since the capacitance is very small and having very high impedance for audio frequency signal. If you measure high …

LM359 Phase Locked Loop

Phase-locked loop is very common in telecommunication, control, and other electronic application. PLL can be used to demodulate FM signal, produce a stable clock signal, or to recover a synchronization signal from noise. Many single chip integrated circuits (IC) are produced for this PLL system, and LM359 is one of them. This PLL is capable …

Complementary Pair Vertical Deflection Pre-Amp

This is Complementary Pair Vertical Deflection Pre-Amplifier circuit. This circuit is modification circuit of Vertical Deflection Pre-Amplifier for 100MHz scope. This circuit remove few resistor-capacitor combination from the original circuit. That components can be removed because they tweaked the response of the amplifier at high frequencies, so no problem. The second two transistors receive +2V …