Iron with sound indication of heating. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Iron with sound indication of heating. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power regulators, thermometers, heat stabilizers

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I offer a simple way to replace the light indication of the heating of the iron spiral with a sound one.

Iron with sound indication of heating

I took the DD1 chip, already soldered to the BA speaker, from a musical postcard. It is powered by the STs21 element of 1,5 V DC, and the light bulb in the iron from 1,5 V AC, so the VD1 KD105B diode and capacitor C1 must be included in the circuit.

The melody in the postcard was turned on by connecting two contacts, so they need to be soldered together. With this, we set the "beginning of the melody" mode. Having removed the battery from the circuit, we release conclusions 1 and 2 for subsequent connection with the contacts of the iron. Solder a diode to one of the terminals.

The assembled circuit is connected to the contacts of the light bulb and fixed inside the iron body. The circuit is checked by turning on the iron in the network (the melody turns on) and heating the spiral to a certain temperature, after which the melody turns off, signaling that the spiral is turned off.

Author: D. Pechenkov, Minsk region.

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