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 is from 1957 Raytheon documentation. The phone must be high impedance with 600 ohms...
Found on a Radio Electronics, but also on other sources and placed elsewhere in this section, this low...
This oscillator produces a signal with a central frequency in 1 MHz. This frequency can be...