Neon Divider (CB6835E)

Found in ancient American documentation, this circuit produces a pulse every 8 Hz of a 400 Hz signal.

| Clique na imagem para ampliar |

Digital Frequency Meter (CB16979E)
This circuit can measure frequencies up to just over 1 MHz and uses CMOS technology. The circuit is...
3-band Wien bridge oscillator (CB21808E)
This variable oscillator was found in a Mullard transistors manual from 1960. The resistor R5 is...
Quail Brooder (CB4467E)
This circuit, from a 1988 documentation, consists of an automatic temperature control using an NTC...