I have a PNP BJT and an LED driver (current sink, theoretically 20 mA and max 3.3 V). The LED driver is connected through an LED to the base of the BJT.
Constant Current 20mA LED Driver Circuits - EasyEDA open source hardware lab
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LuxDrive DynaOhm - 20mA Constant Current LED Driver Pack of 3 - Walmart.com
/i/577131/products/2019-04-27T12%3A48%3A40.464Z-2.jpg?1606306133 "10/20mA Linear CC LED Driver from Pnoxi on Tindie")
10/20mA Linear CC LED Driver from Pnoxi on Tindie
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15PCS LV3301 , LV3302 ( 25mA / 20mA LED Driver IC for Parallel ) SOT89 TO252 | eBay
__07694.1618439742.jpg?c=2&imbypass=on&imbypass=on "Lot of 1000 ON Semiconductor NSI45020AT1G LED Lighting Drivers LED Driver SOD 123 20mA 10% CCR T172060 - TEAMEQUIP")
Lot of 1000 ON Semiconductor NSI45020AT1G LED Lighting Drivers LED Driver SOD 123 20mA 10% CCR T172060 - TEAMEQUIP
10/20mA Linear CC LED Driver from Pnoxi on Tindie
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CL2_Typical Application Reference Design | General LED Driver | Arrow.com
![20mA surface mount LED constant current IC [NSI45020T1G] - $0.55 : Welcome to LEDsales, LEDs and accessories for the DIY enthusiast](https://www.ledsales.com.au/images/SOD-123.jpg "20mA surface mount LED constant current IC [NSI45020T1G] - $0.55 : Welcome to LEDsales, LEDs and accessories for the DIY enthusiast")
20mA surface mount LED constant current IC [NSI45020T1G] - $0.55 : Welcome to LEDsales, LEDs and accessories for the DIY enthusiast
Modules, LED Driver Module PWM Dimming For Control - Walmart.com
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Lt3746euhh Lt3746iuhh Lt3746 - 32-channel 20ma Led Driver With Buck Controller - Replacement Parts - AliExpress
