Powerful Siren by BC337

This circuit was requested by several correspondents. Its purpose was to obtain more power than the siren circuit already available on this website since many years (One-IC two-tones Siren) and to avoid the use of ICs.
A complementary transistor pair (Q2 & Q3) is wired as a high efficiency oscillator, directly driving the loudspeaker.
Q1 ensures a full charge of C2 when power is applied to the circuit. Pressing on P1, C2 gradually discharges through R8: the circuit starts oscillating at a low frequency that increases slowly until a high steady tone is reached and kept indefinitely. When P1 is released, the output tone frequency decreases slowly as C2 is charged to the battery positive voltage through R6 and the Base-Emitter junction of Q2. When C2 is fully charged the circuit stops oscillating, reaching a stand-by status.

Parts:
[...]
C1,C2___________22ÂµF 25V Electrolytic Capacitors
C3______________10nF 63V Polyester or Ceramic Capacitor
C4______________47ÂµF 25V Electrolytic Capacitor
Q1,Q2_________BC557 45V 100mA PNP Transistors
Q3____________BC337 45V 800mA NPN Transistor
SW1___________SPST Toggle or Slide Main Switch (See Notes)
P1____________SPST Pushbutton Operating Switch
SPKR__________8 Ohm Loudspeaker
B1____________12V Battery

Please read more at the original source: http://www.redcircuits.com//Page84.htm
Thank you.

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