The schematic for the pulse width monitor. The heart of the circuit is the transistor current source which charges cap C10 to form an integrator. The theory is that the cap is charged and the voltage across it increases linearly for the amount of time that the injector is energized. As the [...]
Circuit Test Battery by LM3914
This be the checks battery circuit , that easy and perfect , because it shows with LED 10 level. And can check battery get many the size be 1.5V ,3V,4.5V,6V,9V,12V and choose the size current , of battery , get with , such as , [...]
Source : http://www.turbokeu.com
detail :
The LM3914 voltage monitor is also straight forward. As told I use only 6 of the 10 led outputs. A voltage divider on the input (R1-R2) decreases the 7-12V input to about 1.96-3.36V (x0.28). The P1-R4 combination sets the high reference voltage (12/12 of 3.36V, level for 12V readout) [...]
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