| 20 minute timer diagram - drawn from ALPS window defogger timer - next |
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Description: This diagram is drawn from an automotive defogger window timer. 2 pins of the timer are intentionally left out according to the circuit board. (See huge picture at bottom) Go back
| U1this ic is no 555 but some RC oscillator - counters - driver circuit.. | |
| Pin | input/output |
| 1 | Gnd |
| 2 | Output |
| 3 | |
| 4 | |
| 5 | |
| 6 | |
| 7 | |
| 8 | |
U1 --- M5257 TIMER 7X01 OR 7810
Q1 -- BASIC PNP TRANSISTOR
Q2 --- TR --TRANSISTOR
D2 --- DIODE
D3 --- DIODE
D4 --- DIODE
D5 --- ZENER DIODE
D6 --- LED ORANGE COLOR
C1 --- 10uF 10volts
C2 --- SILVER CAP
R1 --- 0.56k ohm
R2 ---0.82k ohm
R3 --- 1k ohm
R4 --- 560k ohm
S1 --- PUSH BUTTON
RLY1 --- OMRON RELAY, one resistor parallel to coil inside
