Melodious call on the UMC8 chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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The melody changes automatically, it sounds completely, when the call button is pressed again, the next melody does not turn on if the previous one has not ended. 1W 4ohm. DA400 UMS5 (Upit 8-0,1V). Pr1-homemade in the form of a piece of wire with a diameter of 1-0,4 mm and a length of about 8 cm. Voltage less than 1V (operating voltage C8) at the output of the diode bridge depends on R1,35.
To increase the volume of the call, you can increase the voltage supplying the power amplifier to VT1 by applying C1 with a larger capacitance and C4 to the appropriate voltage. C6 is selected to a sufficient value so that there is no switching to the next melody after a pause in the previous one. The charge rate of C5 and the time after which the melody will change depend on C6 (usually 1-2 notes of the previous melody have time to sound), C5 also affects the required capacity C6, C5, C6 should be of minimum capacity.
Care must be taken when installing the device, as it has a transformerless power supply.
Publication: cxem.net
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