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USB to Serial Adapter RS-232 Serial Port to USB The USB to Serial adapter (converter) lets you use a serial PDA, GPS, cell, etc. with a standard USB port. This adapter is the easiest way to add a serial port to your computer. Many PDAs, digital cameras, GPS units, barcode scanners, and other equipment require [...]

This Circuit is a simple Analog to Digital Interface with a capability of 10 to 12 bits resolution.
10 bits means 1024 counts or parts of a full scale FS which is close to 3-1/2 1999 counts.
In this 1 V can be read as 1.000 V that means even 1mV can be resolved for FS of [...]

This is Circuit Step-Up Converter with Undervoltage Lockout. By IC LT1073
3V INPUT BATT
5V OUTPUT 100mA LOCKOUT AT 1.8V
* 1% METAL FILM
† L1 = 68μH GOWANDA GA10-682k
OR CADDELL-BURNS 7300-11
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3V [...]