Conrail subsequently swapped out the Ignitrons in all of the remaining units for silicon diodes in the late 1970s and early 1980s, in-house and without any horsepower upgrades.
22.
Another method that was familiar in discrete-device logic circuits used a diode and a resistor, a germanium and a silicon diode, or three diodes in a negative feedback arrangement.
23.
General Electric constructed the first 60 E44s ( 4400-4459 ) using Ignitron rectifiers, and the final six units ( 4460-4465 ) with air-cooled silicon diode rectifiers.
24.
:: : Erm, actually for a silicon diode under forward bias, its resistance is fairly accurately given in ohms by the expression 25 / Ie where Ie is in milliamps.
25.
Germanium diodes ( or sometimes Schottky diodes ) are used instead of silicon diodes, because their lower forward voltage drop ( roughly 0.3V compared to 0.6V ) makes them more sensitive.
26.
The voltage drop across a forward-biased P-N junction in an ordinary silicon diode is 0.6v . I'm pretty sure the voltage drops in LED's are comparable.
27.
For example, a very common choice in texts about circuits using silicon diodes is " V Knee " = 0.7 V . Above the knee, the current continues to increase exponentially.
28.
It is used to detect recoiled target atoms and scattered beam ions using several detectors namely silicon diode detector, time-of-flight detector, gas ionization detector, etc . Such detectors are described below.
29.
A silicon diode has a typical forward voltage of 600 700 mV, while the Schottky's forward voltage is 150 450 mV . This lower forward voltage requirement allows higher switching speeds and better system efficiency.
30.
:: I agree it looks like half a 4148 but replacement depends on what its doing in the circuit : If it is biasing ( or compensating ) a silicon BE junct, then it better be a silicon diode.
