| No | Part number | Description ( Function ) | Manufacturers | |
| 4 | EL42 | Pentode |
 LA RADIOTECHNIQUE |
|
| 3 | EL42 | Output Pentode |
 ETC |
|
| 2 | EL42 | Output Pentode |
 Mullard |
|
| 1 | EL42 | Output Pentode page 1 2 3 4 5 6 7 8 9 10 11 12 EL42 sheet 1 2 A B C D E F G H I FP date 1953.11.11 1953.11.11 1948.03.01 1948.03.01 1948.03.01 1948.03.01 1948.03.01 1948.03.01 1948.03.01 1948.03.01 1948.03.01 1999.07.04 |
 Philips |
|
[1]
List of most widely used semiconductors
| Part Number | Function | Manufacturers | |
| 1N4007 | The 1N4007 is a rectification diode that is designed for high-voltage applications, typically up to 1000V. It has a maximum current rating of 1A and a forward voltage drop of around 0.7V. |
 Vishay |
|
| LM317 | This is a popular adjustable voltage regulator. |
 ON Semiconductor |
|
6N137 | LM393 | 2N3906 | 2N2222 | TIP120 | 1N5818 | LM324N | A1015 | SMAJ20CA |
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