Wide Band AC Voltmeter This voltmeter is capable of measuring ac signals as low as 15 mV at frequencies from 100 Hz to 500 kHz. Full scale sensitivity may be changed by altering the values R1 through R6 (R=Vin/100 uA).The C ... read more>>
JFET Voltmeter This very simple voltmeter circuit uses a 50-mA meter in a bridge circuit. It is useful for noncritical applications.The Circuit Diagram of JFET Voltmeter ... read more>>
Fet Voltmeter A 2N3819 FET provides a solid-state VOM. The 2N3819 acts as a cathode follower in a VOM. The bias offset (meter null) is obtained with R14 and R12 sets full-scale calibration. R2 through R9 should tot ... read more>>
Fet Voltmeter II This FETVM replaces the function of the VTVM and rids the instrument of the usual line cord. In addition, FET drift rates are far superior to vacuum tube circuits, allowing a 0.5 V full-scale range wh ... read more>>
DC Millivoltmeter An LF356 op amp is used as a gain amplifier with the output taken across R5. When a full-scale current of 1 mA is flowing through the meter, exactly 1 V appears across R5 (should be 1% tolerance or be ... read more>>
