Senior Member
Joined: 15/06/2011
Location: AustraliaPosts: 819
| Posted: 05:30pm 09 Nov 2011 |
ok the sm1 board you see the green three way term block ..it has two negative terminals and a positive terminal....you dont need to apply power here if you use the usb lead ...the power switching is done through diodes and there for when plugged into a PC iot will get 5 volts from the usb supply via the connecting cable also if using the front power term`s just get a 6 volt dc plug pack or a small power supply the board draws around 150 ma .. u can run it of a 6v sla battery if you want to .. the second ground on the terminal block is a spare gnd...also "R8 "is the resistor to jumper accross if you want higher sound gain...sparkey
technicians do it with least resistance