Probe KG-250G switch needle head diameter is 3.0 spring exposed switch needle

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

The remote control switch described in this paper is reliable and easy to debug, and can realize nine-way control. It is used to remotely control various household appliances and devices that require multiple controls. The entire circuit is composed of two parts, transmitting and receiving.

The transmitting circuit is shown in Figure 1. The encoding is done by a pulsed telephone number dialing integrated circuit CIC9110. When any key of "1~9" is pressed, the dedicated pulse generator outputs a corresponding high-level pulse from its 9-pin, and its speed is up to 20/sec. These pulses are sent directly to pin 1 of A to control the gated oscillator consisting of A and B gates. The oscillation frequency is about 38 kHz, and then VT1 is boosted by C-gate buffer, and the modulated emission is emitted by the infrared light-emitting tube. Infrared pulse signal.

The receiving circuit is shown in Figure 2 (only one control circuit is drawn), the power is turned on, and D3 converts the received infrared pulse into a weak electrical signal. After the amplifier IC2 is amplified, the original encoded signal is output by the 6-pin, D5. D4 and R, C form a pulsating rectifier circuit, and IC2 is the main device for completing multi-channel control. The following is an example.

When D3 receives 4 pulses, VT2 is saturated for 4 times, and its collector inputs 4 counting pulses to IC terminal of IC4 (IC4 is a decimal counting/pulse distributor). At this time, after IC4 counts and decodes Its 4 terminal constant height, short delay of R12, C10, voltage regulator D7 is broken down, VT3 VT4 is turned on, high level is added to the R end of EC4 via D6, so that it is reset, and VT5 is turned on instantaneously. At the instant of conduction, VT5 supplies a current to the J1 winding to bring its contacts into contact, and the power to the controlled load is turned on through the J1 contact. J1 is a new bistable memory self-locking relay whose contacts can be locked in an internal mechanical state without the need for a power supply. When the transmitter No. 4 button is pressed again, the receiver repeats the above work process, and the J1 contact is released. It is worth noting that although the 1 and 3 terminals of JC4 also output a high level (about 50mV), due to the delay of R12 and C10, it is not enough to break the Zener tube, so it will not make 1, 2, 3 The action of the road, and only when a certain end is high, can trigger the circuit behind, which is the key to the remote control.

The 3DG130D, 9014, 9015 and other triodes in the component selection circuit can be used with a β value greater than 100; D7 is a 2V/0.5W Zener diode capacitor except for the electrolytic capacitors; the resistor is 1 /16W metal film resistor; J1 selects the domestic new ZS-01F self-locking relay. There are no special requirements for the remaining components.