Solar flashlight (CB20488E)

This circuit charges a battery to power a flashlight at night. The circuit is from an English publication from 1991.

LT1173 LCD Bias DC to DC Converter (CB14605E)
We found this circuit in the Linear Technology Applications of 1997. The circuit uses components of the...
High frequency VCO (CB20604E)
This circuit can generate signals up to 100 kHz. Found in documentation from the 1980s, it makes...
Broadband MOSFET amplifier (CB9180E)
Found in Popular Electronics from the 90s, this circuit has 7,500 ohm of input impedance. The circuit...