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Reviewed in the United States on February 24, 2025
Good quality and just as it was advertised
Scientia est Deus
Reviewed in the United States on June 23, 2024
I needed a duty cycle of less than 50% without a need for an external inverter circuit. The simplest possible 555 circuit used in this module cannot generate anything less than a 50% duty cycle. The addition of just two diodes in a slightly more complex circuit would have allowed sub-50% duty cycles. Also, as mentioned by others, the interaction of frequency and duty cycle settings make precise adjustments a significant pain.
Robert
Reviewed in the United States on May 15, 2024
This was one of several Ferwooh products I tested in one setting. All lived up to or exceeded expectations.By inspection, the boards appear professionally made, without evidence of rosin splatters or bad metal at the joints.Electrically, it seems as advertised. Somehow, I've managed to spend ~40 years in electronics and not really worked with NE555. (Blasphemy!) At ~$2USD each, these package up these well known parts and provide easy screw controls to independently control frequency and duty cycle via turns (oh, so many turns) of a trim pot. Simply labeling the pots would make this a more likable process - especially once you have two of these in your parts bin five years from now and this listing has disappeared and you're trying to reconstruct the listing from the schematic that you hope you can still find.Via jumpers, you can control orders of magntude for freq, amplitude, and duty cycle and use the pots to dial in your goals. Whether you're banging on stepper motors or feeding an opto-isolator to drive PWM led strips (NOT WS281x family - they're different beasts totally. On-board LEDs give you a visual hint if your board is alive or left jumpered to the wrong metric prefix.It's awkward that changing duty cycle changes the freq, but that just seems to be the way that 555 works. It's the price of simplicity.I like that the part is analogue enough that you can feed it between 5-15VDC and get out 4.2-11.4VDC without drama. No need for level shifters and such if you're interfacing atmega vs. esp32 and such - the board just copes.
PRODUCT REVIEWER
Reviewed in the United States on May 11, 2024
What is not to like? THREE clock sources that run from 1 Hz to 200 KHz. It's a great little device for the DIY hobbyist. And, by golly, only 2 bucks a piece? I don't know how they can manufacture and populate the boards at that price.I have three minor quibbles about this device, however. The frequency and duty cycle cannot be adjusted independently. Changing one affects the other. Nonetheless, I could get it to work for my application. There is no visible silk screening to indicate which of the two pots controls frequency, and which controls duty cycle. There should be. Finally, adjustment screws on the pots are really, really tiny and hard to use, even with a jeweler's screwdriver.tl;dr; at two bucks each, you should buy a handful.
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