As shown in the figure is 135 film reporting circuit. This circuit is mainly composed of counters C180 and TWH8751. Among them TWH8751 makes up the oscillator, its oscillation frequency is about 1kHz.
The count switch K2 in the circuit consists of a conductor lead from the brass contact piece fixed in the hole position of the 135 film with epoxy resin and the body. When the 135 film is moved, each small square hole is touched, then the contact is made. The tablet is in contact with the body once and produces a count signal. At power-on, the C180 is reset because the contact piece of the first small hole has been in contact with the body. When the 9th hole of a photo arrives, 8 count signals are generated. At this time, Q4 of C180 shows a high level, which makes BG turn on. Oscillator TWH8751 receives low power because of ST'' (2 feet) input. Began to oscillate, and the signal output from the 4th pin will drive the horn to sound and inform the owner that the picture is in place.
When debugging the circuit, first close the count switch K2, and then close the power switch K1 so that the LED lights up and Q1 to Q4 are all low. Then K2 is opened and then closed a total of eight times, Q4 is high, adjust R2 to BG conduction, speaker sound, adjust R4 can change the tone of pronunciation, adjust R5 can change the size of the volume.
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