Radiator temperature indicator Circuits

This radiator temperature indicator can be designed using electronic circuit diagram bellow .Temperature indicator consists of two special zener diode, D1 and D2, connected in series to ensure accuracy of 5.96 V Zener voltage at 25 ° C. As long as the radiator temperature not exceeding 50 ° C, thermal indicator will flash a green LED, one orange will be provided for temperatures of 50 ... 75 ° C and a red LED, for temperatures above 75 ° C.

Zener voltage will increase by 20 mV for each temperature increase of a degree Celsius temperature. Radiator temperature corresponding voltage level is compared with two reference voltages, IC1 and IC2 using. When the temperature reaches 50 ° C, IC2s output goes to logic state "1" so that T3 leads and following ignition with diode D4. At 75 ° C, IC1s output is in logic state "1" and, therefore, T2 and T3 will, so that D3 and D4 lights are off. ------Radiator temperature indicator Circuits ----

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Very Simple Peak Indicator Circuit

This series is made to indicate that the amplifier has been given the maximum signal, the amplifier has the ability to be at its peak. if the lights do not mean the signal-plus volume.the way it works is the LED lights will light up when given a signal that more than 1.8 volts, the average amplifier will be saturated (maximum) if the signal was given more than this. 

The circuit is very simple to the point that we forget that making a series of peak signal can in this way. circuit is mounted on the output tone control IC, master mixer output, or input power amplifier. This series does not impose on other circuits.survived the experiment!

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Fuse Circuit with Status Indicator

This is a design circuit diagram of a fuse circuit. The circuit has an automatic status indicator. This circuit can be added to circuit that operates from 12V DC. As long as the fuse is intact, the LED D3 will glow continuously and when the fuse blows off the LED will start and continue blinking. The fuse F1 can be a metal wire fuse with your required rating. This is the figure of the circuit.


The operation of the circuit is begin from the first part of the circuit that includes an astable multi vibrator built around transistors Q1 and Q2.The output of the multi vibrator is coupled to the base of Q3 via diode D2.When the fuse is intact the base of Q3 will be pulled to a positive voltage by the resistor R5. The transistor will be ON and the LED D3 remains glowing. When the fuse of blown off, the base of Q3 will no longer be pulled to positive voltage and now the only biasing available at the base of Q3 will be the output from the astable multi vibrator. Now the transistor Q3 will start switching in the frequency of astable multi vibrator and the LED will blink in accordance.

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