converter

8 converter The 4047 low power astable/mono- stable multivibrator constitutes an excellent heart for a simple converter which can provide a 245 V AC output from a 12 V DC Input. For this application, of course, the IC is connected in the astable mode. The symmetrical squarewave signals available at the O and Q outputs are amplified by a pair of darlington transistors (T1 and T2) and then fed to the secondary winding of a low voltage transformer (2 x 10 V 60 VA). The 245 V AC output is then avail- able from the primary winding of the transformer. The frequency of the output voltage can be varied between 50 and 400 Hz by adjusting the preset potentiometer P1. 80573 M. Cafaxe