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DIY Level Indicator Kit Electronic Production Kit
US$1.99 US$9.99

Q: What voltage values are Vcc and the typical Input signal?
The use of C2 suggests this is only for AC, probably audio signals. Is that correct?

Asked by MSmith on 2023-07-21 04:23:31

Genteel DC5V, C2 is an electrolytic capacitor, J2 is an audio signal.

2023-07-22 12:43:57 Helpful (2)
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Answers (1)
MSmith 08/03/2023
Well packed. The lid clips on securely enough so that no screw is really needed to hold it on (no screw was provided but there is a hole for one to fit in). There is an on/off slide switch which is handy for development work. Cells securely held in place. Wires colour coded and long enough at about 120mm.
4 Slots AA Battery Box Battery Holder Board with Switch for 4xAA Batteries DIY kit Case
US$1.40 US$6.00
0
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KING DO WAY 4 Pack Clothes Storage Bag Large Capacity Closet Organizer Home Outdoor Travel
US$37.94 US$45.53

Q: Two questions: 1 - is the size 44.5x36.3x10.6 cm (as in the writing) or 60x40x35cm (as in the picture) ? 2 - Can the divider be taken out?

Asked by MSmith on 2021-10-22 11:55:12

Filipe 1- Size is 60x40x35 cm 2- Divider cannot taken out 3- God product

2022-03-13 06:19:46 Helpful (0)
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MSmith 04/01/2022
Works. Does what it claims. Handy size. Excellent value for money. Took only a few minutes to learn to use it and to set the unit of measurement to metres. Minor criticisms are: instructions difficult to read because of blurred symbols and small font size; fiddly controls for large fingers.
MUSTOOL 80m Digital Mini Laser Rangefinder with Electronic Angle Sensor M/In/Ft Unit Switching USB Charging Pythagorean Mode Distance Area Volume Measure Laser Distance Meter
US$25.99 US$39.99
0
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MSmith 02/02/2021
Works well even with rechargeable cells. Has a clear display. Possibly because I am old I have to make sure my hands are warm (looking pink not white). Look carefully at the polarity signs in the battery compartment as they are not too obvious and not intuitive. Attractive price.
BOXYM JSL-X201 Finger-Clamp Pulse Oximeter Oxygen Saturometro Pulse Rate Monitor Digital SPO2 Medical Saturatiemeter Vinger Monitor
US$16.99 US$20.99
0
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MSmith 20/09/2020
Good value and neat size. Polarity marking is not obvious: the arrows on the side point to the positive terminal. The positive terminal (as with button cells) is slightly domed (curves upwards) and has a conducting surface of slightly smaller diameter than the negative flat surface.
3pcs 5.5V 4.0F Farad Capacitor 5.5V4.0F Super Capacitor Double Layer Capacitor H Type
US$8.99 US$10.99
1
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Comments (1)
MSmith 20/09/2020
Only used in a test circuit so far and only required to supply 60mA but it did the job. Small enough to fit inside a UK household mains surface mount box together with relay and other circuitry.
220V to 5V 5W AC-DC Isolation Switch Power Supply Module
US$8.99 US$10.99
0
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MSmith 20/09/2020
Only used in a test circuit so far and only required to control 60W bulb but it did the job. Small enough to fit inside a UK household mains surface mount box together with relay and other circuitry.
3pcs 5V Low Level Trigger One 1 Channel Relay Module Interface Board Shield DC AC 220V
US$2.40 US$8.99
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MSmith 20/09/2020
Compact for the high capacitance value. Leakage on the one I testes was about 50Mohm which is satisfactory. good value for money. In my pack one was case dented so I discarded that one.
20pcs 1000uF 25V Radial Electrolytic Capacitor 10 x 17mm 105°C
US$2.99 US$4.99
0
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MSmith 20/09/2020
good action. large enough to be easy to press.
5Pcs 3A 125V Momentary Push Button Switch OFF-ON Horn Green Plastic
US$6.99 US$8.99
0
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XY-SK80 DC-DC 80W 5.1A Adjustable Automatic Buck Boost Power Supply Module CC CV Step Up Down Voltage Converter Solar Charging Module
US$16.99 US$20.99

Q: If I set the output to 9V, 0.2A, then later the input power source is switched off, when the power source is switched back on, will the output still be set to 9V, 0.2A? That is, are last time's settings restored on power up?

Asked by MSmith on 2020-09-05 04:04:19

Dyphone Yes,last time's settings restored on power up.

2020-09-15 01:02:56 Helpful (0)
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MSmith 19/08/2018
This worked well on old baked on fatty marks on the outside of pans. After several uses the working end looked blocked up with dirt and I was expecting it to stop working but I was wrong. Two months on it is still working. All I have had to do is strip off a couple of mm of the sheath and it keeps on working well. It works on crockery too. I have put some carpet tape around the sheath to give a better grip in soapy water. The photo is of the effect on a frying pan's outside after a few rubs in one place when the stick has been used for several weeks.
Honana 2 Pcs Magic Stainless Steel Cleaning Brush Stick Metal Rust Remover Kitchen Cleaning Tools
US$12.99 US$10.99
1
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3pcs 5V Low Level Trigger One 1 Channel Relay Module Interface Board Shield DC AC 220V
US$2.40 US$8.99

Q: Is there a built-in reversed diode in parallel with the relay coil to prevent a high voltage spike being sent back to the driver circuit on switch off?

Asked by MSmith on 2020-09-03 10:28:39

hansdeboer Yes, there is, as it should be. Otherwise it would destroy you Arduino port immediately.

2020-09-03 03:38:56 Helpful (1)
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Answers (1)
MSmith 23/08/2020
Simple, light, takes up practically no room in your pocket or handbag. One size but stretches a little. As with most simple masks, if you wear spectacles they will fog up a little when you breathe out. Good value. Likely to help protect others from the risk of protection while speaking, breathing, coughing and sneezing as it covers the nose adequately.
3pc Polyurethane Sponge Mask Anti-haze Breathable Mask
US$7.98 US$30.99
0
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MSmith 15/08/2020
It works well enough. Adequate attachment to vehicle. Just big enough for my phone which has a folding cover/case. A bit fiddly to put the phone into it - especially if working one-handed.
ABS Car Phone Holder Air Vent Outlet Stand Gravity Linkage Clip Mount for iPhone/Samsung/
US$9.87 US$11.84
0
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MSmith 15/08/2020
These do work well for several months. Very useful for stubborn, baked on dirt on metal or ceramic surfaces. Functional rather than cosmetically attractive.
Honana 4 Pcs Magic Stainless Steel Cleaning Brush Stick Metal Rust Remover
US$7.99 US$9.99
0
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MSmith 15/08/2020
Clear display. Automated alternate display of voltage and current but you can't display just one of those.. Easy to use. Self-powered. useful in a wide range of scenarios. Excellent value for money. The device's calibration was accurate according to two of my other measuring instruments.
DC 3-7.5V 0-5A V2.0 USB Voltage Current Meter Charger
US$0.99 US$9.99
0
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MSmith 15/08/2020
Clean. Grease free. Adequately packaged. Good selection of sizes.
Geekcreit® 40pcs FR-4 2.54mm Double Side Prototype PCB Printed Circuit Board
US$5.99 US$15.99
0
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MSmith 15/08/2020
Handy. Comprehensive. Easy enough to use for basic functions. Readout digits fairly small (for aged eyes) but then there is not much spare space on the device.
3 in 1 USB Tester Battery Voltage Current Detector Mobile Power Voltage Current Detector
US$12.99 US$15.99
0
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MSmith 15/08/2020
As described. Adequately packaged - a few slightly bent pins.
10pcs 3296W 100K ohm Trimpot Trimmer Potentiometer
US$5.99 US$7.99
0
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