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2. 1N400x rectifier diode - Wikipedia

   en.wikipedia.org/wiki/1N400x_rectifier_diode

   1N4001 diode in DO-41 axial package (through hole mount) A schematic symbol for general-purpose silicon rectifier diodes Current-voltage characteristics of a 1N4001 at different temperatures The 1N400x (or 1N4001 or 1N4000 [ 1 ] ) series is a family of popular one- ampere general-purpose silicon rectifier diodes commonly used in AC adapters for ...

3. 1N4148 signal diode - Wikipedia

   en.wikipedia.org/wiki/1N4148_signal_diode

   Three 1N4148 diodes in glass DO-35 axial package. The black band on the right is the cathode side. Diode schematic symbol vs cathode marking on the package. The 1N4148 is a standard silicon switching signal diode. It is one of the most popular and long-lived switching diodes because of its dependable specifications and low cost.

4. List of 1N58xx Schottky diodes - Wikipedia

   en.wikipedia.org/wiki/List_of_1N58xx_Schottky_diodes

   A schematic symbol for Schottky diodes 1N5822 Schottky diode with cut-open packaging. The semiconductor in the center makes a Schottky barrier against one metal electrode (providing rectifying action) and an ohmic contact with the other electrode. SS14 schottky diode in DO-214AC (SMA) (SOD-106) surface-mount package version of 1N5819 [1]

5. Doorbell - Wikipedia

   en.wikipedia.org/wiki/Doorbell

   Doorbell mechanism from 1884 in Andrássy Avenue, Budapest Antique mechanically operated shop doorbell on a torsion spring. William Murdoch, a Scottish inventor, installed a number of his own innovations in his house, built in Birmingham in 1817; one of these was a loud doorbell, that worked using a piped system of compressed air. [1]

6. 2N7000 - Wikipedia

   en.wikipedia.org/wiki/2N7000

   The symbol doesn't always show the internal diode formed between the substrate and the source/drain/channel. Electronic symbol The 2N7000 is housed in a TO92 package, with lead 1 connected as the source , lead 2 as the gate , and lead 3 as the drain .

7. List of telephone switches - Wikipedia

   en.wikipedia.org/wiki/List_of_telephone_switches

   EMS-1 (The ITEC Electronic Modular Switch is an electronic direct control switching system. The modules are combined to form a complete switch or any of the modules can be added to your present Step-by-Step Systems.) EMS-2 (The EMS-2 RURAL SWITCH is a stored program control analog switch designed to be cost-effective in small exchanges.