The circuit presented here is a microwave detector, it has the function to detect and indicate the presence of electromagnetic radiation in the microwave spectrum, ie in the SHF band (Super high frequency - Super Ultra frequency). Its use is very wide and can be used in the field as well as on the bench. With this detector is possible to test equipment such as transmitters, cell phones, microwave ovens, or any phone that is in its frequency range.
Microwave Detector Circuit Diagram
Microwave Detector Circuit Diagram
Its operation is simple, the sign of Microwave and captured by the receiving antenna W1 and W2, amplified by the transistor VT1, reaches the detector, two diodes, VD1 and VD2, and then to an AF amplifier, transistor VT2 where a signal is emitted sound. According to the creators, this detector electromagnetic high frequency radiation has a range that can reach over 10 meters, depending on the power of the emitted radiation.
Detector electromagnetic radiation in the microwave spectrum
As the project is Russian, the components, especially semiconductors has a strange marking, but substitutes may be used, provided they meet the criteria of the circuit, such as gain, frequency and voltage.
L1 is a coil 5 to 7 turns of enameled 0.3-0.6 mm in a shape of 6 mm diameter wire.
Diodes, I think we can start to put the BAV99, but any diode high speed signal may be experienced. The transistor is critical as well, I think we get a replacement for the desired frequency is BRF92 up to 5Ghz or BFG591, which can reach 7GHz quietly. I am citing this as substitutes SMD video below colleague used the BRF92 and BAV99 but BFG591 can replace without problems.