Stable timer on KR1006VI1. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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The popular KR1006VI1 microcircuit contains two precision comparators, which provide a voltage comparison error of no worse than 1%. This microcircuit is the basis for building various devices: multivibrators, converters, delay units, etc.
I offer my version of the timer on KR1006VI1, which is distinguished by high stability of time intervals.
Timer DA1 is controlled by a high-level input pulse (logical "1") at input C (pin 7). When pin 7 is low (logic "0"), the comparator is disabled and capacitor C1 is not charged. Output 3 DA1 - high level. The timer is started by the SB1 button, but any control scheme with the corresponding output level ("1") can be used instead.
When the SB1 contacts open, i.e. a high level is applied to pin 7 of DA1, capacitor C1 is charged through the R2-VD2 circuit. The output (pin 3) is still high. After some time (with the R2 and C1 ratings indicated on the diagram - about 3 minutes), the voltage at C1 reaches the comparator trigger level, and a low level ("0") appears at the DAT output. In the future, it does not change (until the power of the node is turned off).
The time delay depends on the ratings of C1 and R2 and can vary widely.
Diodes VD1, VD2 are introduced into the circuit to reduce the effect of the leakage current of the capacitor C1 on the stability of the time interval. Diode VD3 prevents voltage surges when switching relay K1. Capacitor C3 smoothes the ripple of the power supply. Pin 3 of DA1 is connected to the reset input R (pin 4) to prevent the device from going into self-oscillating mode.
To control the timer in a non-contact way, instead of SB1, it is enough to install a simple inverter at the input (shown in the diagram by a dotted line).
The resistance R4 is selected depending on the magnitude of the input signal. The timer is triggered when "0" is applied to the VT2 base.
Fixed resistors - ~ MLT-0,25. Oxide capacitors C1 and C3 - K50-24 or similar, C2 - type KM6. Transistors - KT503, KT504. KT315 with any letter index. Diodes can be replaced with D220. D310, KD503 and similar.
Author: A.Kashkarov, St. Petersburg
See other articles Section Clocks, timers, relays, load switches.
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