Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

DIY smart tweezers that measure RLC and impedance

Regular multimeter isn’t convenient to measure parameters of SMD components. Also most of multimeters measure only R and C, but not L and Z(impedance). For SMD components you need tweezers that can reach small contacts. If your budget is limited and you want ZRLC measurement features, then probably go with DIY version. Ajoyraman shared his instructable, where he builds tweezers around TMS320F28027 microcontroller. To switch between modes he uses ADG714 analog switch and rail to rail operation amplifier MCP6022. To make tweezers small and yet functional, he is not using any displays on them. Instead he connected tweezers to PC via USB where information is seen in nice PC GUI. You can find all codes in GitHub. We have seen how resistance and capacitance and inductance can be measured. More interesting feature in tweezers is impedance measurement. The idea is to generate sine wave and pass it through unknown impedance. By measuring amplitude and phase on target PC software is able to process and display real and imaginary part of unknown impedance. PC software is very well built with complete… Continue reading

High Accuracy Digital LC Meter

You’re get involved with many projects that require to measure the impedance of a component? You couldn’t find the right tool to help you overcome the hassle? Well, in this case, you might want to create a brand new high accuracy digital LC meter. Digital LC meter, or it also known as the “LCR” meter, is the electronic test equipment, which normally being used to measure the impedance, such as inductance, capacitance and resistance! The digital LC meter started to gain its popularity over the analog type, due to their high accuracy and high input impedance. Some other features like auto zeroing, auto ranging, auto power off and down mode are making the digital LC meter more powerful than the analog LC meter! This project is based on the PIC16F628 and PIC16F84 base inductance/capacitance, where the measuring range is from 0 to >0.1 uF for capacitance and 0 to >10mH for inductance. The expected accuracy is in between +/- 1% of reading +/- 0.1pF or +/- 10nH. An LM311 comparator with positive feedback is being used to make a parallel… Continue reading