I’ll update RV1’s potentiometer setting in-place if it’s just a value/property change; first I’ll inspect RV1 to confirm its current part and editable properties, then apply the change and verify it.
RV1 is already a through-hole Bourns 3386P vertical potentiometer/trimmer, wired for base bias. I don’t need to replace it because replacing would risk breaking its existing connections; I’m just verifying the current state now.
RV1 is already a 10k through-hole potentiometer/trimmer: Bourns 3386P-1-103LF. I verified it is wired correctly for base bias: pin 3 to 12V, pins 1 and 2 tied to the BASE_BIAS node, so no replacement was needed.
12 V 2N2222 common-emitter audio amplifier PCB based on the uploaded reference diagram, with AC input coupling, adjustable base bias, emitter bypass, collector load, output coupling capacitor, and speaker connector.
Properties
USB-C 5V sink, default USB-C current advertisement; design power path compatible with 0.5A to 3A sources without blindly drawing 3A
Digital T/RH sensor over I2C, ultra-low-power Wi-Fi/BLE MCU module, USB-C VBUS reverse/OVP/UVLO/OCP protection, protected 5V to 3.3V regulation
Consumer use target; select RoHS/REACH capable components where possible
5
V
Consumer environmental sensing
2.4GHz 802.11 b/g/n Wi-Fi plus BLE 5.x
Pricing & Availability
Distributor
Qty 1
Arrow
$0.83–$3.80
Digi-Key
$1.39–$5.37
HQonline
$1.67
LCSC
$0.86–$2.44
Mouser
$1.56–$4.27
TME
$1.35–$2.04
Verical
$0.72–$7.22
Controls
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