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Controllers and timers - list of circuit diagrams
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This is a circuit intended to be used in basketball shot clock
author: Milardo de Guzman visits: 354 
A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps
author: Andy Collinson visits: 339 
A timer circuit with independent mark and space periods
author: Andy Collinson visits: 329 
This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days and beyond.
author: Ron J visits: 252 
This circuit is based on a simple asymmetric oscillator. The length of time the relay remains energized - and the length of time it remains de-energized - are set independently. With the component values shown in the diagram - both periods are adjustable from about 1 to 30 minutes
author: Ron J visits: 249
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