I adapted this from a circuit I found a long time ago.. The idea is a relay timer that can be adjusted period-wise since the vast majority of cheap timers on the market are locked in to 24hr cycles..
Operation: ICs 1&2 and adjacent pieces multiply the xtal clock to produce 0.5s, then 60s periods..
ICs 4&5 simply count minutes and reset themselves (and the flip-flop) once every day period.. (Note, in the circuit, these chips are currently wired for 24hr (1440min) days..
ICs 6&7 are to be set with the number of delay minutes before resetting ICs 4&5 respectively.. Once ICs 6&7 set/reset the flipflop during the initial cycle they sit dormant, and IC's 4&5 will be sync'd to repeat each day period, IC4 turns it on, IC5 turns it off.. (Note ICs 6&7 are also wired for 24hr.. This is nonsensical for their purpose obviously, but I was cutting/pasting images..)
The battery is only there to keep the count timing in the case of an outage
For example, lets say ICs 4&5 are each set for 1080 minutes (an 18hr day), IC6 wired for 60min, and IC7 wired for 120min.. When the circuit is started, it will count 60minutes then IC6 will reset/sync IC4 turning on the relay.. 60minutes after that, IC7 will reset/sync IC5, turning off the relay.. ICs 4&5 will continue this operation each day since they will each do their switching job every 1080 minutes..
So anybody notice any glaring stupidity??
Operation: ICs 1&2 and adjacent pieces multiply the xtal clock to produce 0.5s, then 60s periods..
ICs 4&5 simply count minutes and reset themselves (and the flip-flop) once every day period.. (Note, in the circuit, these chips are currently wired for 24hr (1440min) days..
ICs 6&7 are to be set with the number of delay minutes before resetting ICs 4&5 respectively.. Once ICs 6&7 set/reset the flipflop during the initial cycle they sit dormant, and IC's 4&5 will be sync'd to repeat each day period, IC4 turns it on, IC5 turns it off.. (Note ICs 6&7 are also wired for 24hr.. This is nonsensical for their purpose obviously, but I was cutting/pasting images..)
The battery is only there to keep the count timing in the case of an outage
For example, lets say ICs 4&5 are each set for 1080 minutes (an 18hr day), IC6 wired for 60min, and IC7 wired for 120min.. When the circuit is started, it will count 60minutes then IC6 will reset/sync IC4 turning on the relay.. 60minutes after that, IC7 will reset/sync IC5, turning off the relay.. ICs 4&5 will continue this operation each day since they will each do their switching job every 1080 minutes..
So anybody notice any glaring stupidity??
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