Photomultiplier tube trigger (CB8868E)

We found this circuit in a 1970’s Philips documentation. The circuit uses components from that time.

Neon 555 (CIR25235E)
This circuit consists of a small inverter to light a low voltage neon lamp. The circuit is from a...
Battery Status Indicator (CB15852E)
This circuit uses two LEDs to indicate the state of a battery, the voltages at which they...
Zener replacing capacitor (CB6744E)
In the figure we have the way to use a zener instead of a filter capacitor. The zener can have the...