NPN BJT rubber diode aka adjustable zener like reference voltage learning electronics lesson 0042 - YouTube
current - Purpose of these two transistors - Electrical Engineering Stack Exchange
SMC SY3240-5LZ valve, dbl sol, base mt (dc), SY3000 SOL/VALV
Vbe Multiplier - CircuitLab
Rubber diode - Wikipedia
Black Snap-on Hole Plug 2.5mm~30mm Silicone Rubber Blanking End Caps Tube Pipe | eBay
Figure 10 | Theoretical Investigation by Quantum Mechanics on the Tunnel Diode Effect of Electric Conductive Characteristics and Haptic Sensing in MCF Rubber
Fully rubbery Schottky diode and integrated devices | Science Advances