report:
1) avalanche transistor noise:
success with 2n3904s (NPN) as per:
http://willware.net:8080/hw-rng.html
but should do more with either extra 2n3904 as amp:
see: http://willware.net:8080/hw-rng.html
or using 74LS04 (biased by 2.7k resistor across I/O to bias into "linear region" where they act as op-amps
white noise: very quiet
2) modified simple 40106 (Hex inverting Schmitt trigger) acting as
osciillator:
a) standard configuration is
-VR-R--¬ | | | |\ | -1-| >-|-2-> next stage | |/ | CAP | GND
Frequency dependent on R and VR and capacitor (higher uF, lower freq)
b) first step is inserting feedback transistor-based VR between 1 and 2
c) also VR between inputs of successive gates 3 to 1
d) untying capacitors to ground and put LED in transistor circuit
e) connect one of capacitor ends to wire ariel - radio and electromagnetic sensitivity - this will be fence/radio/street performance module:
outline all modules to be made with PCBs
f) used Darlington pair to amplify signal for small speaker
research ideas:
1) input to 40106 circuit and how we can further effect from outside.
2) place 40106 gates in a loop
3) amplify transitor noise from avalanche