Electro-Matic Electroscope

prusaprinters

This is a simple electroscope that takes little skill to build all it takes is an analog dial, an on-off potentiometer, two or more 2N2222A transistors, and a nine-volt connector.Here's a simple circuit diagram, the inductor symbol is a stand-in for the antenna. https://www.tinkercad.com/things/g1spRuQbVKd-exquisite-migelo/editel?tenant=circuitsSince the meter dial is hard to find I will list links to it and other components.Meter dial https://www.walmart.com/ip/Analog-Current-Panel-Meter-DC-0-20A-Ammeter-Square-Shape-Current-Test-Mechanical-Pointer-Type-DC-Panel-Meter-Amp-Meter/1478603223?athcpid=1478603223&athpgid=AthenaItempage&athcgid=null&athznid=utic&athieid=v0&athstid=CS020&athguid=HeAp8SUygbfJGnaJ5Z2P5MxIGCBjoza8W2Ay&athancid=null&athena=true Transistors https://www.amazon.com/McIgIcM-2N2222-Transistor-2N2222A-Through/dp/B06XPWS52G/ref=asc_df_B06XPWS52G/?tag=hyprod-20&linkCode=df0&hvadid=241915774055&hvpos=&hvnetw=g&hvrand=3465630089949708931&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9011313&hvtargid=pla-487387619261&psc=1Battery terminal https://www.amazon.com/dp/B081ZRBDVW/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B081ZRBDVW&pd_rd_w=FvJTY&content-id=amzn1.sym.88097cb9-5064-44ef-891b-abfacbc1c44b&pf_rd_p=88097cb9-5064-44ef-891b-abfacbc1c44b&pf_rd_r=F0MFNT3FAR8PFCKVBC9Z&pd_rd_wg=TvCOx&pd_rd_r=07e6ae6b-c59a-4854-9756-12644b567e3e&s=electronics&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw&smid=A38MGJGACQAQBR&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzODQ3R1BTMVY3QlNYJmVuY3J5cHRlZElkPUExMDAxNzMzMk0zWjFBWDFIRUNXUiZlbmNyeXB0ZWRBZElkPUEwNjcwNjUzMVhNUTdFVzdaMDFTSCZ3aWRnZXROYW1lPXNwX2RldGFpbCZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU= Potentiometer-switch https://www.walmart.com/ip/4Pcs-500K-Ohm-Single-Linear-Taper-Potentiometers-with-On-Off-Switch/2502089325?wmlspartner=wlpa&selectedSellerId=101276123Wides and screws are up to you I just had some sitting on my workbench and used them.I have not verified these components since mine came from broken radios. If you find a problem let me know.