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.

Frequency Synthesizer 4046 (CB25257E)
We found this CMOS circuit based on the PLL4046 in the December 1989 issue of Radio Electronics magazine....
Common Telephone Line Simulator (CB6873E)
This simple circuit can be used to power a simple communication system using ordinary telephones....
1 to 100 mA Shunt Regulator (CB15573E)
The shunt type regulators are connected in parallel with the load, deflecting the current to...