You'll find this works well when you're in the middle of a crowd
SOIC24 product from MAXIM INTEGRATED PRODUCTS with the model number MAX7221CWG+Product details
8" / 66 x 56 x 20 mm Weight 0
493 1/4"-20 and Location Pin Adaptor Carriage
VESA Mount for Monitors Up to 22"
STMICROELECTRONICS LDK120M29R Fixed LDO Voltage Regulator, 1.9V to 5.5V, 150mV Dropout, 2.9Vout, 200mAout, SOT-23-5 Matthews 309104 You'll find this works wellThis is a Fixed LDO Voltage Regulator, 1. 9V to 5. 5V, 150mV Dropout, 2. 9Vout, 200mAout, SOT 23 5 product from STMICROELECTRONICS with the model number LDK120M29RProduct details Output Type Fixed Input Voltage Min 1. 9V Input Voltage Max 5. 5V Fixed Output Voltage Nom. 2. 9V Adjustable Output Voltage Min Adjustable Output Voltage Max Output Current 200mA Dropout Voltage Vdo 150mV LDO Regulator Case Style SOT 23 No. of Pins 5Pins Operating Temperature