Signal generator (CB21057E)

Found in Popular Electronics, this '90s circuit generates harmonic-rich signals for testing audio equipment.

Symmetric Power Supply using Transistors (CB12665E)
Using transistorized regulators with NPN and PNP transistors we can create a symmetrical source of...
TPS54824 Synchronized Step Down SWIFT Converter
Mouser Electronics is stocked with Texas Instruments SWIFT Step Down TPS54824 Synchronized Power...
Photocell Amplifier (CB15490E)
Photoelectric cells can be used as sensitive light sensors. However, the low voltage they generate...