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Johnny_B_Goode 2019-12-02 18:07:53
A nice DIY electronic project, spoilt by excluding the 3 terminal CUT connector block from the BOM (4* value rating) and the -ve clearance between the display panel and the barrel power connector which needed an SMD resistor on the LCD to be shifted & the top of the barrel socket to be filed down (4* quality rating). It would add value NOT not to skimp on the terminal block. I had to order a pack of ten just in case the better alternative of a 3 gang ZIF socket, turns into a hunt for Unicorn Droppings. I can see the validity in choosing a terminal block as a cheap way to minimise stray reactances and achieve a reliable connection to the CUT though. I bought this for its capability of measuring Ls & Cs as low as 1pF and 0.01μH which the other testers just won't touch. It was only after assembling it (which had been a straight forward soldering up exercise) that I felt the lack of a suitable enclosure to house the finished board. Banggood don't appear to have any suitable project boxes on offer for this kit and trawling through all 29 pages of reviews failed to find any suggestions (not even a Thingiverse 3D printer file). I'm now looking further afield (Ebay or Amazon) for a suitable enclosure or possibly even design one that my son-in-law can print out for me on his recently upgraded 3D printer. I connected it to my bench supply to measure its power requirements which vary from a low of 26.5mA on the CEx scale maxing out to 91mA on the CEx >500μF scale when measuring a 1000μF cap. It requires a minimum of 6.8v and I'd be leery of using more than 16 volts. . The relays alone account for 40mA (luckily only one at a time). The TO220 packaged 7805 is obviously not an LDV type! TO220 packaged devices typically have a free air dissipation rating of 2W max. Here, sticking to a 1W limit means using no more than a 16V DC supply to be safe and a 9 to 12 V @200mA min rated wallwart will be an ideal power source (it's not 'battery friendly').
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