
OSDEHA PSU
mbrennwa/OSDEHA
Amplifier for electrostatic headphones using directly heated triodes in the output stage

The BD138 is a bipolar made by Jiangsu Changjing Electronics Technology (CJ) in a TO-126 package with 3 pins. -55℃~+150℃ 1 PNP 1.25W 1.5A 100nA 40 500mV 5V 60V PNP TO-126 Bipolar (BJT) ROHS.
PCBKit's library has its KiCad symbol (Transistor_BJT:BD138, from KiCad's library) and its footprint (Package_TO_SOT_THT:TO-126-3_Vertical, from KiCad's library), ready for a KiCad board. 421 are in stock at JLCPCB (part C2992045). 6 open-source boards in 5 repositories on GitHub use it.
| Pin | Name | Type |
|---|---|---|
| 1 | E | Passive |
| 2 | C | Passive |
| 3 | B | Input |

mbrennwa/OSDEHA
Amplifier for electrostatic headphones using directly heated triodes in the output stage



Jack05325/ProgrettiHensemberger
Benvenuto in questa repository! Qui troverai una raccolta di progetti che ho realizzato per l'ITI P. Hensemberger.


Jack05325/ProgrettiHensemberger
Benvenuto in questa repository! Qui troverai una raccolta di progetti che ho realizzato per l'ITI P. Hensemberger.
<iframe src="https://pcbkit.io/embed/parts/cj/BD138" title="BD138 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/cj/BD138.jpg" alt="BD138" width="1200" height="900">[](https://pcbkit.io/parts/cj/BD138)Yes. The symbol is Transistor_BJT:BD138 and the footprint Package_TO_SOT_THT:TO-126-3_Vertical, both drawn on this page. PCBKit places them on a board for you when you design with it.
TO-126, with 3 pins. Its footprint is drawn on this page.
Jiangsu Changjing Electronics Technology (CJ) publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C2992045, with 421 in stock; the sellers' links on this page open their listings.
Parts like it in the library: the BD139 by STMicroelectronics, the BD140 by STMicroelectronics, the BD139-16 by STMicroelectronics and the BD139(RANGE:100-250) by Jiangsu Changjing Electronics Technology (CJ). Check their datasheets: a part that fits the footprint may still differ in its ratings.
6 boards in 5 repositories on GitHub; the most starred are listed on this page, with their KiCad files.