A "Joule Thief" on steroids. Converts a dying AA battery (0.8V) into a stable 9V supply for a multimeter or microphone preamp.
While your smartphone has more computing power than a 1980s supercomputer, the physics of voltage, current, and Ohm's Law has not changed a single bit. 1001 more practical electronic circuits pdf
The book calls for many obsolete parts:
: The schematics provided, including those for transistors and integrated circuits, have been tested to ensure they work as described. A "Joule Thief" on steroids
Published by TAB Books and edited by Michael Fair, the "Master Handbook of 1001 More Practical Electronic Circuits" is a comprehensive, 698-page resource featuring pre-tested, practical schematics covering applications from basic switches to RF preamplifiers. This analog-era, analog-history guide includes essential component diagrams and troubleshooting tips for hobbyists and engineers. For more information, explore the digitized copy at Internet Archive Amazon.com Master Handbook of 1001 More Practical Electronic Circuits The book calls for many obsolete parts: :