A book with simple everyday patterns electronic devices for the "advanced" amateur radio.
Book of Kashkarov A.P. “Assemble electronic structures yourself in one evening” contains various designs of electronic devices that will become indispensable for solving everyday tasks that arise both in apartments and houses, and when servicing a car.
Here is a list of some schemes that are given in the publication:
Powerful backup power
Protection of power supply from short circuit in load
Low Power Converters & Voltage Multipliers
The electronic signaling device on a microassembly K190KT1
Sensor device with sparing load control
Sensitive touch device with delayed shutdown
Touch device with trigger
Digital bass reflex
Simple temperature alarm
Universal generator for tuning audio equipment
Hidden wiring finder
Cooling Alarm
Chip KR100VI1 in ultra-stable timer mode
Safety and security structures
...other
Loot or download a book with these and other schemes at the link: