Easy Circuit Tester

Easy Circuit Tester In everyday work, I noticed that most of the time when using a multimeter it takes me to check the contacts, so this project has matured for a very long time, and only today it was done :) Using the tester, you can check not only the contacts, but also the batteries, diodes, transistors, resistors, capacitors and much more (resistors and capacitors up to a certain rating), and you can also check the presence of mains voltage. Circuit and gerber-files in the project archive. *I ordered a printed circuit board only now (2020/03/07) https://jlcpcb.com/ , so I’ll shoot the assembly video after I receive my order. PCB Dimensions 74.52 x 21.2mm Parts links below: Transistors Q1,Q2 BC847B SOT-23 - http://ali.pub/4jnd4f LED red 0805 - http://ali.pub/4jnd9v LED green 0805 - http://ali.pub/4jndga Diode 1N4007 SOD-123FL - http://ali.pub/4jndk6 Resistor R1 39k 0805 - http://ali.pub/4jnf9m Resistor R2 120k 0805 - http://ali.pub/4jnf9m Resistor R3 115 0805 - http://ali.pub/4jnfgt Resistor R4 2k 0805 - http://ali.pub/4jnfir Active Buzzer 0942 - http://ali.pub/4jnyk6 Battery CR1220 - http://ali.pub/4jncyz Battery holder CR1220 - http://ali.pub/4jnezb Power switch MSS22D18 - http://ali.pub/4kohsr Pogo Pin p75 - http://ali.pub/4jnftn Magnets 3x3 mm - http://ali.pub/4izmg4 Links to used tools: NOGA deburring tool and Blades - http://ali.pub/4im7d7 Mini Wireless Grinder - http://ali.pub/4hdmfe Polishers Buffers Abrasive - http://ali.pub/4hdmqo Dremel Tools - http://ali.pub/4hde9z Disc sander 50 mm - http://ali.pub/3md2wr Nylon Polishing Pad 50 mm - http://ali.pub/3nt7wj Kit 1 polishing pad - http://ali.pub/3u2h8w Kit 2 polishing pad - http://ali.pub/3u4c69 Polisher Wax Buffer - http://ali.pub/3u2hif Clamp medical pliers - http://ali.pub/4hx83y Air Gun - http://ali.pub/4jqlax Solder Paste MECHANIC - http://ali.pub/4jqlib AB Glue Epoxy - http://ali.pub/4hvg7o Super Glue 502 - http://ali.pub/4ipb7y E8000 Strong Liquid Glue - http://ali.pub/4ipc5s My favorites: Thank yo