Voltage & Continuity Tester
for direct and alternating voltages up to 60 V
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Component list
R1 = 1MOhm
R2 = 1kOhm
Semiconductors:
D1 = LED, low current, red
T1,T2 = BC547C, BC548C or BC549C
Miscellaneous:
BZ1 = miniature piezo transducer (passive)
K1 = 2-way pinheader, lead pitch 2.5mm (0.1 in) or two solder pins
S1 = single-pole changeover switch (optional, see text)
Battery holder for two LR03 (AAA) or LR6 (AA) batteries
Enclosure: suitable metal tube (see text)
PCB, available from The PCBShop
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