![File:KVM Switch Equip SW 0407 C - STMicroelectronics L7805CV on printed circuit board-1820.jpg - Wikimedia Commons File:KVM Switch Equip SW 0407 C - STMicroelectronics L7805CV on printed circuit board-1820.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/f/f9/KVM_Switch_Equip_SW_0407_C_-_STMicroelectronics_L7805CV_on_printed_circuit_board-1820.jpg)
File:KVM Switch Equip SW 0407 C - STMicroelectronics L7805CV on printed circuit board-1820.jpg - Wikimedia Commons
![Ymiko Solar Circuit Board,Controller Module,Remote Control Solar Circuit Board Long Bright Automatic Power Reduction 3.2V/3.7V Lamp Controller Module - Walmart.com Ymiko Solar Circuit Board,Controller Module,Remote Control Solar Circuit Board Long Bright Automatic Power Reduction 3.2V/3.7V Lamp Controller Module - Walmart.com](https://i5.walmartimages.com/asr/eb25d94a-6f59-46ed-9e72-9da1f5b1135a.d515e5bcb6ff4d30af0d586fe2b4796e.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
Ymiko Solar Circuit Board,Controller Module,Remote Control Solar Circuit Board Long Bright Automatic Power Reduction 3.2V/3.7V Lamp Controller Module - Walmart.com
![Amazon.com: Solar Power Charging Module Solar Lamp Controller 3.7V Lithium Battery Control Circuit Board with ON/Off Light Control : Patio, Lawn & Garden Amazon.com: Solar Power Charging Module Solar Lamp Controller 3.7V Lithium Battery Control Circuit Board with ON/Off Light Control : Patio, Lawn & Garden](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/61AGkPLRR5L.jpg)
Amazon.com: Solar Power Charging Module Solar Lamp Controller 3.7V Lithium Battery Control Circuit Board with ON/Off Light Control : Patio, Lawn & Garden
![constant current - Can anybody help identity what Q1 and Q2 in this circuit are doing? - Electrical Engineering Stack Exchange constant current - Can anybody help identity what Q1 and Q2 in this circuit are doing? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/FgFnK.jpg)
constant current - Can anybody help identity what Q1 and Q2 in this circuit are doing? - Electrical Engineering Stack Exchange
![Need help identifying Q1. Board is from a Redlion HMI, model: Graphite G07. The screen went black and will no longer turn on. The caps and resistors around Q1 are shorting to Need help identifying Q1. Board is from a Redlion HMI, model: Graphite G07. The screen went black and will no longer turn on. The caps and resistors around Q1 are shorting to](https://i.redd.it/y8qqgup2loga1.jpg)