Point magnetic ring transmitter
RF cable can be customized for other specifications
Crystal oscillator 2.5*2.0mm 2520 0.67M~170M OSC can be supplied at any frequency
The electromagnetic ring emission is composed of four sub-circuits: a clock circuit (built around U5, a 555 oscillator/timer around the unsteady operation configuration), a reciprocal/display circuit (built around U3), one and BCD The output syncs up/down counter 74190 and the BCD output is a countdown configuration.
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