logic probe - Circuitos electrónicos

https://circuitfee.blogspot.com/2013/04/high-voltage-ac-calibrator-circuit.html

https://circuitwiring.blogspot.com/2013/04/how-to-make-light-activated-day-night.html

http://design.dapj.com/2013_11_01_archive.html

https://elecfreecircuit.blogspot.com/2013/04/first-order-band-pass-filter.html

https://felicinwiring.blogspot.com/2013/04/birdie-doorbell-circuit.html

https://fillingdiagram.blogspot.com/2013/04/make-simple-machine-gun-sound-effect.html

https://joey89924.blogspot.com/2013/03/solated-full-duplex-rs232c-interface.html

https://www.circuitsathome.com/mcu/arduino/usb-shield/troubleshooting-arduino-usb-host-shield

http://www.circuit-finder.com/rss/newposts/67

http://www.solorb.com/elect/logprobe

http://dangerousprototypes.com/blog/tag/logic-probe

http://www.cryogenius.com/hardware/counter

http://www.sparkfun.com/products/10086

Logic Probe with Pulse, 555, 741, Resistor/Capacitor tutorials.

http://www.tonyvanroon.com/oldwebsite/circ/probe1.htm