Optical receiver for covert channel experiments (http://www.grandideastudio.com/portfolio/optical-covert-channels/)

Digital version using Everlight PLR135/T9 Fiber Optic Receiver.

TBD

Revision B of this whose sole purpose is the two notches in the side to allow for a small 3D printable case. Thingiverse link soon. :) Small changes in the routing also, should make no real difference.

R 4x 1206 (SMD 1/4W 4,7K) SW1 Kodierschalter KMR 10 oder KDR 10 oder Jumper

R 4x 1206 (SMD 1/4W 4,7K) SW1 Kodierschalter KMR 10 oder KDR 10 oder Jumper

This is a simple board meant to work as an adapter for hooking an aimtrak up inside a Namco arcade gun (so it can be used with a PC with functional recoil). The board fits into the handle of the gun and contains through-holes for each connection between the aimtrak, connections in, and the solenoid in the gun. The board also includes a diode for the solenoid along with a TIP102 + Resistor for triggering the solenoid. Not much else to say, the board could use a lot of improvements but it gets the job done.

A low battery indicator board that uses two transistors and a 10k trim potentiometer to set low battery voltage. When the battery voltage is high, Q2 is active, allowing current to flow through. The current flow brings the base voltage of Q1 to 0V, with Q1 subsequently not being active and the LED is not switched on. When the voltage on the base of Q2 is lower than 0.7V (given by the output of the voltage divider on R4) Q2 is off. The current flowing through R2 thus goes only into the base of Q1. Q1’s base is now at a voltage higher than 0.7V, which activates Q1 and turns on the LED, indicating a low battery voltage.

Sensor PCB for NodeMCU using MQTT

ESK-564-110203