This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
This circuit simulates a low-level siren and can be supplied with voltages from 5 to 15 V....
XTAL from 4 to 20 MHz can be used in this oscillator. The XRF choke can range from 10 to 100 µH...
Launched in early 1999, the new ADC12181 high-speed A / D converter is suitable for applications...