Beeper Circuit

This box is a portable transfer standard to maintain and carry with you a local time signal of 59 short beeps (pips) plus a long 0.4 sec beeeeep on the full minute. At the start of the job, the box is started by manually synchronising it by ear with a reputable time signal (GPS, WWV/H, or Telstra 1194 on a fixed landline telephone). The box then keeps bleeping, can be taken to an observation site, and can be used there for an hour or so, before the time slowly drifts too far out of calibration.
Beeper Circuit - schematic

In the box is the core of an analog quartz alarm clock with a second hand, and we use the second pulses that drive the solenoid that moves the second hand. Clock quality varies but most keep time to a couple of seconds per day, which is le

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