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.
| PARTS LIST | |
| R1 | 2.2MΩ |
| R2 | 18KΩ |
| R3 | 1KΩ |
| R4 | 1KΩ |
| R5 | 1KΩ |
| R6 | 1MΩ |
| VR1 | 500KΩ (504) |
| C1 | 220nF (224) |
| C2 | 10nF (103) |
| D1 | LED |
| D2 | LED |
| 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 IC PINOUT
1-30 minutes: C1 = 220nF ; VR1 = 500KΩ.
1-60 minutes: C1 = 470nF ; VR1 = 500KΩ.
1-120 minutes: C1 = 470nF ; VR1 = 1MΩ.
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.
