How to make a circuit that will allow you to use dead batteries to power your electronics. The Joule Thief circuit explained. http://graywolfsurvival.com/2491/the-joule-thief-a-preppers-best-friend-for-dead-or-homemade-batteries/

The Joule Thief: A prepper's best friend for dead or homemade batteries. Learn how to take a few cents worth of parts (or scrounge them from dead electronics) and make a circuit that can make dead batteries work again.

Sensor de humedad (Diagrama+video) - 1 CI 555 - 3 resistencias (R1, R2, R3) de 1K - 1 capacitor (condensador) (C2) de 0.1uF - 1 condensador (capacitor) electrolítico (C1) de 10uF - 2 diodos LED. Uno rojo y uno verde - 1 bateria cuadrada de 9 voltios

Sensor de humedad (Diagrama+video) - 1 CI 555 - 3 resistencias (R1, R2, R3) de 1K - 1 capacitor (condensador) (C2) de 0.1uF - 1 condensador (capacitor) electrolítico (C1) de 10uF - 2 diodos LED. Uno rojo y uno verde - 1 bateria cuadrada de 9 voltios

555 Electronic Metronome Circuit

555 Electronic Metronome Circuit

Tesla's Spirit Radio  http://gizmodo.com/5390059/build-the-spirit-radio-that-creeped-out-tesla-himselfTesla's Spirit Radio

Build The Spirit Radio That Creeped Out Tesla Himself

Tesla’s Spirit Radio uses a simple crystal radio circuit connected to a computer sound-in jack to generate spooky sounds from all kinds of electromagnetic sources. As you will see, it creeped the hell out of Tesla himself, according to Higher.

555 variable pulse generator

‪ circuit is either an electronic circuit or a piece of electronic test equipment used to generate rectangular pulses.

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