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The unit is based on a PHILIPS FM880 link transceiver originally supplied to a Telecom Australia specification for telephone applications in remote areas of Australia. The FM880 is part of a family of equipment that includes the PHILIPS FM828/FM814...
This transceiver features a three-stage transmitter and a direct-conversion receiver. The oscillator for the transmitter is controlled by Q1, with the frequency regulated by X1, which also functions as the local oscillator for the receiver. Buffer Q2 drives the...
A resistive voltage divider is utilized to establish a bias voltage for the input (pins 2 and 3). The demodulated FM signal is introduced to the input through a two-stage high-pass filter, which serves to provide capacitive coupling and...
The optical key functions as an infrared door opener for homes, garages, and similar applications. Diagram 27.0 represents the key, which is a transmitter module that emits a modulated infrared (IR) beam. The modulation frequency can be adjusted using...
This is a simple electronic code lock circuit that can be easily constructed. The circuit consists of one transistor, a relay, and several passive components. Its simplicity does not compromise performance, and it functions effectively. The circuit operates as...
A 2N366 is configured as an audio feedback oscillator using an audio transformer. Adjust R1 for proper operation and the desired audio note. The circuit utilizes a 2N366 transistor, which is a general-purpose NPN transistor, serving as the primary active...
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