Infrared modulated transmitter (CB7247E)

This simple Philips circuit from the 1960s can use any general-purpose transistor. The signal is modulated at 2.7 kHz.

Voltage Level Detector (CB4660E)
This circuit is intended to trigger an alarm when the input voltage exceeds one value and to...
Digital Speedometer (CB17306E)
This circuit, found in a 1986 documentation, uses an optical sensor to count pulses and, in its...
10 W 12 x 115 VA inverter 10W (CB7297E)
This circuit was found in Delco documentation from 1966. The components are from that time....