Digital stopwatch 0-99sec circuit
#stopwatch
#digital
#timer
#counter
#display
#precision
#time measurement
#electronics
#circuit design
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Divide-By-Odd-Number Counter
This circuit symmetrically divides an input by virtually any odd number. The circuit contains n + 1 clocks to achieve the desired divisor. By selecting the proper n, which is the decoded output of the 74LS161 counter, divisors from 3...
Discharge time relay circuit
Discharge time relay circuit. The timer utilizes a field effect transistor, providing high timing accuracy and extended timing capabilities. With R3 set to 1,000,000 ohms and C at 200 microfarads, a delay time of 8 hours can be achieved. When...
Odd-number-counter-divider
This circuit, illustrated symmetrically, divides an input by virtually any odd number. The circuit counts n + 1/2 clocks twice to achieve the desired divisor. By selecting the appropriate n, which is the decoded output of the LS161 counter, divisors...
Automatic sprinkler controller circuit diagram 1
The automatic sprinkler controller circuit consists of a clock timing controller, a monostable flip-flop, a bistable flip-flop, an electronic switch, a self-excited multivibrator, a counter, a solenoid valve control circuit, and a power supply circuit. The power supply circuit includes...
Sequential-timer
The timer circuit provides independent control over the output's on and off intervals, which can vary from 0.055 seconds to 30 minutes, and remains relatively unaffected by power-line transients. IC1 is a CMOS programmable timer chip that consists of 24...
Repeating Interval Timers
Do not use the on-board relay to switch mains voltage. The board's layout does not provide adequate isolation between the relay contacts and the low-voltage components. If mains voltage switching is required, mount a suitably rated relay in a safe...
Timer
The timer can be utilized for time intervals of up to seven minutes. Activation is achieved by touching the turn-on plate, after which an alarm will sound for a brief duration upon the completion of the selected time, followed by...
repeating interval timer
This circuit features an adjustable output timer that can re-trigger at specified intervals. The output duration can range from a fraction of a second to over half an hour, with the ability to repeat at consistent intervals from seconds to...
Timer with alarm
The circuit features two timing ranges: from 10 seconds to 5 minutes and from 1 minute to 80 minutes. It is powered by a 9-V battery. An LED is connected in a manner that allows for a consistent flashing frequency...