Automatically turning the lights off in the toilet has long been concerned about ham radio. Forget to turn off the light in the toilet almost everything. However, the "problem" is not solved completely forget about the "animals" that live in most of our houses.
The figure shows a schematic diagram of solving the "problem".
In parallel with the contacts of the light switch toilet SB1 through restrictive R1 resistor series-connected neon bulbs HL2, HL3 and similar the circuit R2, HL4. Parallel to the light bulb HL1 included three phase engine fan hoods M1 type VN-2 (used in the computer EC-1841). Necessary the phase shift at a voltage of 220 V 50 Hz is provided by capacitor C1 type C-10 0.47 µf 250 V 50 Hz.
When the light switch SB1 is turned off, burning neon lights HL4 HL2.... so how are they connected to the network through the internal resistance of the light bulb lighting toilet HL1 and the winding of the motor M1. Bulbs HL2, HL3 selected type SG-9 (the maximum voltage of 95 V and a current of 3 mA) and placed inside the toilet, illuminating it for cats. HL4 type MH-6 and the resistor R2 are arranged in the housing switch SB1, if the shell is not translucent, in the case of the switch opposite HL4 drilled hole 0 4 mm. Burning HL4 signals that toilet free, no combustion is that the toilet is occupied or breaking the circuit power HL4.
When you switch SB1 lamp lights lighting toilet HL1 and included the extract fan M1. In the diagram the dotted line marked items are already standing in each toilet.
Replacement of neon light bulbs SG-9 other undesirable because of their lower brightness, another spectrum of radiation, less efficiency.
Replacement MH-6 is possible in a serial chain, consisting of a diode, resistor, led ALV, ALG. Green glow LEDs are desirable because he "semaphoric" that toilet is free. There are gas-filled bulbs green glow, but they are bigger in size and quite rare.
Instead of VM-2 can be applied with a fan of another type with small size and with three-phase or two-phase motor, for example, from old tape recorders and players Use commutator motor is undesirable because of - made electrical interference. The capacitor C1 can be replaced by K73-16 0,47 µf 400 V. the Resistors R1 and R2 may be of any type, compact.
The main psychological problem, to lure the cat e unlit toilet, solved specific for cats red and infrared lighting unoccupied toilet bulbs HL2, HL3.
Bulbs HL2, HL3 is placed in the upper part "cogitating" rug, hung behind the toilet, just above the cat's toilet. Mat made on the basis of an unnecessary piece of linoleum. It is this very basis perfect for "cortidrene". So the cat is not damaged bulbs HL2, HL3, they closed the lid.
P. S. Incidentally offer a series circuit HL4, R2 in parallel contacts button to your doorbell, placing them inside the button like placement inside the switch SB1. A neon bulb MN-6, as smallest on size keyboards to fit in a square button. As the MH-6 is not cap (socket), reliable outboard installation it can be achieved by putting it on conductors PVC tube from the wires by wrapping the conductors of the "eight" thread directly from their exit from the housing of the bulb, and then, having fastened the thread with varnish for the nails. The output conductors of glass is gently fixed.
Author: N. The Ivashin, Minsk