555-channel temperature test circuits

Posted on Mar 28, 2007

Circuit shown in Figure, when used in multi-temperature test, switch the thermocouple corresponding channel. 555 brightest are at the core monostable delay circuit, such as Cli

555-channel temperature test circuits
Click here to download the full size of the above Circuit.

ck AN, because the 2-pin was low, the IC1 set, was 3 feet high, J1 pull, the thermocouple channel ON. Meanwhile, C1 through R1 charging it, when the charging voltage reaches the threshold level 6 feet 2/3Vdd, the 555 reset pin 3 referred to the low level, in turn triggering a second stage IC2, the IC2 set, turns ON Road thermocouple, and then click the trigger. If J1 is closed, the cycle can be monitored. Each level of the delay time (ie measuring time) td 1.1R1C1, icon parameter corresponding delay is about 1 second. LED1 ~ LEDn LEDs also turn lights, as a monitoring indicator. Figure a circuit when power-up, there are a few pieces of LED light tubes flicker at the same time, therefore, to improve the circuit shown in Figure b. After accessing R, C network, boot, since C voltage can not change suddenly, so that the reset terminal pin 4 is forced reset state, 3 feet showed low output, as the charging capacitor C, so that was 4 feet high level, IC trigger timing in a wait state levels, have improved the accuracy of the test.

Leave Comment

characters left:

New Circuits



Popular Circuits

CIRCUIT CREATOR- Schematic & PCB Design
PIC Light Chaser with PIC16C84
pierce xtal oscillator circuit
3w fm transmitter
3 digits Digital volt meter
300B solid state
designing a phantom antenna power supply system
Simple 6-Input Alarm
555 audio oscillator circuit diagram of a radio-frequency drive