Another roundup of assorted products for electronics hobbyists, part 7

A weekly roundup of things I came across on AliExpress this week that might be useful to other readers.

Inexpensive LCD displays in various formats: 1602, 2004, and 12864. The 1602 is the best deal by far - link, $1.27, with shipping extra, but not too expensive.




And speaking of displays, how could I not mention signal level meters? Of the ones I like that are still reasonably priced, I can recommend this fairly simple one. Its advantage is that it has no clock, which can sometimes get annoying - link, $24.99 + $6.73 shipping.



I reviewed a meter like this once. Mine had a Samsung display with a blue color, but unfortunately they’re no longer available for sale, and probably never will be again :(


The versions with clocks look the same, and are often cheaper, by the way. For example, this one is $29.50 link


There’s also a slightly different design, and the page lets you choose whether to get it with or without a remote - link, $34.59


I’ve wanted to buy this meter for a long time, but somehow I keep balking at the price: $38.13 link. But as far as I can tell, it’s actually a spectrum analyzer, and it also has an OLED display.




But I’ve gotten a bit carried away with the meters.
A very interesting meter for current, voltage, capacity, and temperature, with the ability to control an external relay and send data to a smartphone. There’s a wide range of models with different maximum currents, from 30 to 1000 A. I like the entry-level model best - link, just $13.75.
There’s another model for a lower voltage, but it’s cheaper: link, $12.77
There’s also a model with a relay built in. It costs a little more: link, $14.72. One caveat, though: I’m not sure whether it comes with a temperature sensor, so you’ll need to check.




The model shown above is the latest in a line of universal meters. I once wrote about a similar one; here’s an example - link, $6.64




A new, compact adjustable converter that even comes with an enclosure. It has a universal input thanks to the SEPIC topology inside - link, $44.35–49.27, shipping extra
Output voltage up to 36 V, current up to 5 A.




A decent, powerful step-down voltage converter, with current up to 30 A and input voltage up to 70 V link, $26.30




A powerful, inexpensive step-up converter. I get asked about these quite often: link, $11.80–16.99 depending on the power rating (1200–1800 W).



Some nice little buttons, in case anyone could use them. Lot of 10, link, $3.43, shipping extra



Buttons that are just as nice, maybe even nicer, also backlit and sold in lots of 10: link, $2.50–3.50




I get asked very often about batteries for regular flashlights—something inexpensive but reasonably good quality. I’m not a big fan of Litokala, but I’ll recommend these anyway - link, $2.20–19.03 (1–10 pcs).
They also have protected versions, which are probably even better for flashlights - link, $2.81–12.97 (1–6 pcs)




People also often ask about simple but decent chargers. In this category, I can recommend Litokala again - link. Prices vary because there are models with 1, 2, or 4 slots.




If you have links to anything interesting, I’d be glad to see them in the comments :)