Offer an easy way to replace the light indication of the heating spiral iron on sound.
The DD1 chip already soldered to the speaker of the VA, I took out the musical greeting cards. It powered by element SC 1.5 V DC, as the lamp in iron 1.5 In AC, so in the scheme it is necessary to include diode VD1 and KD105B the capacitor C1.
The melody in the postcard included a combination of the two contacts, so they need to be soldered together. We have established the "beginning sounds". Removing the battery from the circuit, we release pins 1 and 2 for later connections to the contacts of the iron. To one terminal of the solder the diode.
Assembled circuit is connected to the contacts of the bulb and secured inside the case iron. Checked the scheme is the inclusion of iron (ringtone included) and heating spiral to a certain temperature, after which the melody is turned off, signaling the spiral off.
Author: Dmitry Pechenkov, Minsk district.