Small multimeter circuit

Test - lowercase jpg

The ultra-small multimeter has a size of 40*80*17MM and can be conveniently placed in a pocket of clothes or hung on the waist. Figure 1-1 shows the appearance of an ultra-small multimeter, and Figure 1-2 shows its internal circuit. The head of the circuit adopts the commonly used 91L16 type 0-300V small voltage meter. The internal resistance of this small meter is 430R and the full current is 0.5MA. If the reader's head is not this parameter, it needs to be re Design peripheral component values.