This circuit is from an American manual from 1974. It uses a diac (Q1) and the SCR can be the TIC106. The transformer has a 12 V secondary with 500 mA and is connected to the SCR anode while the primary is 220 V. T1 is an isolation transformer and D1 is a 1N4004. R1 is d 1 k x 2 W and R2 47 k. C2 that determines the frequency is 470 nF and C1 an electrolytic of 8 uF x 200 V.
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