С2R1 circuit provides a reset trigger circuits DD1 to the original standby when the power is turned on. Oxide capacitor C1 performs the function of the filter element for nutrition. The VD1 diode prevents the reverse voltage surge at switch-on/off of the relay.
The total capacity of the switched load depends on the parameters of electromagnetic relay K1 and in our case limited to 350 watts.
Since the number of discrete elements of the console are small, all of them mounted on a perforated Board plot size 30×40 mm and together with connecting wires are placed in a regular receiver remote call to the compartment for elements of Autonomous power. To reduce the impact of electrical interference it is desirable that the wires connecting the device with the power source and going from relay K1 to the pump, had the section not less than 1.5 mm and a minimum length.
Fixed resistors MLT-0,25 (MF-25). Electrolytic capacitors of the type K50-26 operating voltage at least 16 V. the Remaining non-polar type capacitors KM-6B. The chip DD1 (K561TM2) can be replaced К561ТМ1 without compromising the efficiency of the node, but in this case, you will have to change the schema, because the conclusions of these chips have different purposes. Information about this replacement option can be found in reference books on modern CMOS chips. Transistor VT1 — field, with high input impedance. This allows to minimize the leakage current in the standby state of the radio signal and almost no effect on the output of the trigger, despite the limiting resistor R2 with a low resistance.
Relay K1 can be replaced РЭС43 (performance RS4.569.201) or more, calculated on the trigger voltage of 4…4,5 V and current 10…50 mA. To set the device relay with switch-on current more than 100 mA is undesirable, since the gate of the relay transistor VT1 has a finite capacity.
Receivers radioshow with open covers:
and — from a discrete element; b of the items in the SDM-buildings
Instead КП540А you can apply a field-effect transistor is any of a series КП540 or its foreign counterparts BUZ11, IRF510, IRF521. Led НL1 any, it is convenient to control the relays and the circuit contacts of the Executive. If necessary, the elements Ni and (R3, you can exclude from the scheme without consequences. Additional (manual mode) the pump switch in the diagram shown under the designation ЅА1.
The coil L1 is frameless with 4 mm diameter from a 1.5 round silvered wire in diameter 0.8 mm (turn to turn). The choke L2, type D-06 82 µh inductance (microhenry).
In the basic version provides a self-powered — 2 AA element at 1.5 V. But in the conditions recommended the use of remote call is best done stationary powered by a stabilized power supply with 5 V voltage with deviations not exceeding ± 5%. Such a source can be, for example, the stabilizer on the chip КР142ЕН5А. The current consumption of the transmitter in active mode 35 mA. The current consumption from the power source of the receiving node in constant standby mode does not exceed 10 mA and increases to 50 mA when enabled, is specified in the relay diagram. Other types of relays the current consumption can have a different meaning.
The optimal supply voltage of 5-9 V. receiver to Increase the voltage of the receiving node is not necessary, because the range of the device, this innovation does not increase (tested experimentally by bringing the voltage up to 12V).
The transmitter itself, outwardly representing the body in the form of a key chain the size of a standard matchbox, the finalization is not needed. Not to change once a year battery (the same kind installed in most transmitters, key fobs security alarm system for cars — 12V 23АЕ, the manufacturer GP Ultra or similar), the power of the transmitter is carried out using an industrial adapter with the output stabilized voltage of 12 V and a current not less than 0.5 A, such as the type of TV-182-S.
The tuning coil L1 with a shutter core inside. The diameter of the outer coil of 4 mm, coiling 5 turns of the silvered wire in diameter of 0.8 mm.
L2 — choke type D-06 inductance 82 CTG.
The transmitter antenna is worthy of detailed description. To increase the range of operation to the antenna contact on the circuit Board with pigtail MGTF-0,8 (or similar) solder telescopic whip antenna for radios (available in stores). Or, at least, what is incomparably worse — to use as an antenna similar to the regular stranded wire with a length of 350… 400 mm, fluffed at the end, like the petals of a flower, thin wires (diameter of “flower” — 60…80 mm).
Greatest range of work with a telescopic antenna (in practice) will be the case when the “telescope” was nominated to the middle, that is the same on the 350… 400 mm.
Now, assuming the recommended improvements of the antenna in the transmitter device fails to range up to 200m in line of sight and remote control motor pump or other resistive load, the choice of which is limited by the parameters of the actuating relay and imagination of the author.
A. KASHKAROV, St. Petersburg