bigal_scorpio
Active Member
Hi to all,
I am in the process of building an ESR meter from here **broken link removed** and just getting a bit puzzled about a couple of things.
Firstly as I have not had a lot to do with MOSfets I am worried that I can't tell which is the Source and Drain on the BS170 at the top left.
Also I am puzzled what the Backlight and Credits part does, its below the right hand side of the LCD in the schematic, does the circuit imply that a switch would short RC0 and RC1 and connect them to RB2 when the switch is made? If it does can anyone explain why? And would it need a latching switch?
Also I am assuming that the on and off switches are momentary push to make types, and as there is no other means of disconnecting the battery I wondered if it would be continuously pulling a small amount of current?
Maybe it would be better to add a further switch directly after the battery, maybe a toggle or slider?
Any thoughts?
Thanks in advance for any help.................Al
I am in the process of building an ESR meter from here **broken link removed** and just getting a bit puzzled about a couple of things.
Firstly as I have not had a lot to do with MOSfets I am worried that I can't tell which is the Source and Drain on the BS170 at the top left.
Also I am puzzled what the Backlight and Credits part does, its below the right hand side of the LCD in the schematic, does the circuit imply that a switch would short RC0 and RC1 and connect them to RB2 when the switch is made? If it does can anyone explain why? And would it need a latching switch?
Also I am assuming that the on and off switches are momentary push to make types, and as there is no other means of disconnecting the battery I wondered if it would be continuously pulling a small amount of current?
Maybe it would be better to add a further switch directly after the battery, maybe a toggle or slider?
Any thoughts?
Thanks in advance for any help.................Al