Saturday, January 11, 2014

CD4060 Timer Circuit 1 minute to 2 hours

This really is a 1 minute to two-hour timer change. The 14-stage binary ripple countertop Kind 4060, IC1, has an on-chip oscillator capable of stable operation over a relatively wide regularity variety. In the present circuit, the oscillator frequency is dependent upon an exterior RC coverage linked to pins 9, ten and 11.
CD4060 IC Timer Circuit  schematic 1 min to 2 hours
R1 2.2MΩ
R2 18KΩ
R3 1KΩ
R4 1KΩ
R5 1KΩ
R6 1MΩ
VR1 500KΩ (504)
C1 220nF (224)
C2 10nF (103)
D3 1N4001
Q1 BC547
IC1 CD4060
RL1 Relay
When the power is on, the pulse at junction R6-C2 resets the counter and counting starts. When the counter reaches bit 14 (Q13), pin 3 goes high so that the relay, a 9V type, is turned on via driver Q1.
CD4060 CMOS 14 Stage Ripple Carry Binary Counter Divider Oscillator ic pin configuration
The time delay is set with the aid of VR1. Time delays of between one minute and two hours are possible by appropriate dimensioning of the timing components:
1-30 minutes: C1 = 220nF ; VR1 = 500KΩ.
1-60 minutes: C1 = 470nF ; VR1 = 500KΩ.
1-120 minutes: C1 = 470nF ; VR1 = 1MΩ.
The timer is powered by a 9V PP3 battery. Light-emitting diode D1 does not affect the operation of the circuit and is included merely to show that the timer works. Diode D1 and resistor R4 are , therefore, optional components.

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