9 V to 5 V converter LT1175 (CB14616E)

We found this circuit in the 1997 Linear Technology Applications. The components used were common at the time.

Divide-by-5 7490 (CB255E)
The frequency of TTL square signal is divide by 5 with this circuit. Power supply is 5 V and the...
Proximity Sensor 1 (CB5036E)
This interesting circuit was obtained from a Poptronics of February 2001. The American magazine no...
LED as Photo-Diode (CB10544E)
This circuit was found in an English magazine from 1983, but it can be assembled with BC548 for...