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Maxwell workshop prototypes. (maxwell_notes#6)

With brief explanation. Working clockwise from top left:

1] Broadband/all-band receiver. After: http://www.techlib.com/electronics/allband.htm

Using BAR28 small signal Schottky diode as detector.

2] Broadband receiver with frequency divider. Based on the LM386 audio amp and the 4020 ripple counter - jumpers for output with frequency divided by pins 4,6,9,12,14 as by 16,64,512,4096 and 16384 respectively.

3] Radar/microwave detector. After: http://www.electronics-lab.com/projects/misc/004/index.html

4] EM/ghost detector (can be used with coil or with photodiode (as sound to light)) after Newton C. Braga Electronic projects...

5] Sound to light using LM386 and selected photodiodes (long lead/anode to + symbol).

6] All-band receiver with 50 Hz notch filter (Q or width adjusted with poti). Jumpers for other input.