This receiver we found in a 1992 documentation operates in the 27 MHz band, triggering a relay when the same frequency transmitter is activated. L1 consists of 7 to 8 loops of wire 26 in a 5 mm ferrite core form. XRF1 is a 22 uH shock. The transformers are 10 k primary and 2 k secondary type used as drivers in older receivers. The relay is 6 V, which is the power supply of the circuit.
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