andrewsych
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andrewsych 12/12/2019
It’s a nice compact amplifier. But there is a mistake with the silkscreen on the speaker output terminals. One channel is labeled backwards so the speaker will be out of phase. See the photo showing the correct labels. Also most Chinese Bluetooth receivers have an annoying loud start up jingle. As does this one.
Geekcreit® TPA3110 bluetooth 4.2 Digital Amplifier Board 15Wx2 Class D Stereo Power Amplifier DC 8V-26V
US$10.99 US$13.99
10
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100pcs 5mm Round Purple UV LED Diode Super Bright Water Clear LED Light Lamp Purple Color
US$4.99 US$8.99

Q: Wavelength? 405nm?

Asked by andrewsych on 2019-05-07 01:48:42

BG619351543 No

2021-09-13 02:54:46 Helpful (0)
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andrewsych 13/07/2021
My unit did not come with the carrying case as pictured in the description.
Portable Hiddens Camera Detector Bug Finder Antis spys camera Anti-theft Alarm
US$23.99 US$28.99
0
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andrewsych 29/07/2019
A nice vintage looking analog meter. I prefer this over a digital meter. I did modify the meter movement by installing two 3mm warm white LEDs inside the meter.
YIHUA 502D 5V 2A Mini DC Power Supply for Mobile Phone Repair
US$15.78 US$32.99
1
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andrewsych 25/11/2019
I bought the dual input version. The displayed data is quite handy for one to see the charging current of the device’s battery. As the battery is close to a full charge the current slowly decreases.
UNI-T UT658 Series Type A Type C Electric USB Voltage Safety Tester Voltmeter Amperemeter Charger Capacity Meter Volt Current
US$14.39 US$19.99
0
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andrewsych 30/03/2019
This is a great kit that shows how the electromagnetic field works by lightning up the supplied neon lamp when held close to the coil.
DIY Dry Battery Powered Tesla Coil Kit Mini Tesla Module Kit
US$5.22 US$4.39
2
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andrewsych 14/11/2019
Nice but.. I downloaded the driver indicated in the item description and it’s working. But I have the Retropie system loaded and the display only shows text and no graphics. The graphics are only visible through the HDMI port on my system.
Geekcreit® 3.5 inch TFT LCD Touch Screen + Protective Case + Touch Pen Kit For Raspberry Pi 3B+/3B/2B
US$16.86 US$26.99
0
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andrewsych 27/09/2019
What a beautiful lamp. I’m going to use it during the holidays. The glass lamp was broken during shipping. I contacted customer service and they promptly sent a replacement. Thank you.
E27 3W Vintage Edison LED Multi-color Holiday Democratic Light Bulb For Party Christmas AC85-265V
US$6.18 US$14.23
0
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DIY Electronic LED Spectrum Display Training Kit Voice Control
US$6.64 US$9.96

Q: I’ve built three of these kits. One worked perfectly, the next one has random noise on the display which isn’t reacting to sound, and the third has very weak microphone gain. Does anyone have a schematic of this kit?

Asked by andrewsych on 2019-06-26 01:01:42

Tricoaster I did not have it

2019-07-02 03:47:12 Helpful (0)
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Answers (1)
andrewsych 03/07/2019
This is a good clock. But you have to be able to solder surface mount components. One IC has a very small pitch and you need a tiny tipped soldering iron and 0.5 mm solder.
Geekcreit® Large Size Rainbow Color Digital Tube DS3231 Clock DIY Kit
US$24.99 US$26.99
0
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andrewsych 29/01/2019
It’s well built and feels good to hold. The red light mode is good fo preserving one’s night vision. The main LED is pretty bright. I put a flat top 18650 inside and it fits fine.
XANES 1305 T6+COB 1500Lumens Foldable Magnetic Tail LED Inspection Flashlight
US$11.00 US$17.00
0
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andrewsych 29/01/2019
It’s worth the price.
XANES RD03 4-In-1 Function 650nm Ballpen Capacitive Touch Red Laser Pointer
US$3.48 US$5.54
0
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andrewsych 22/01/2019
This lamp is pretty bright for a tritium lamp.
1pcs Trit Vials Tritium Multicolor Self-luminous 15-Years 3x22.5mm
US$24.99 US$29.99
0
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andrewsych 05/08/2018
Some of the LED’s burned out after a few days.
1M USB/Battery Powered Love Sign Shaped Warm White Pink LED Neon String Light for Wedding Birthday
US$10.27 US$10.93
0
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andrewsych 18/06/2018
I’ve just received one of these meters. It comes with a nice storage pouch and two set of probes. The backlit display is bright and easy to read. The accuracy is close enough to my Fluke meter. The low ohms scale isn’t that good for hundredths of an ohm measurements. The reading is constantly changing. But otherwise it’s a great inexpensive meter.
ANENG Q1 9999 Counts True RMS Digital Multimeter AC DC Voltage Current Resistance Capacitance Temperature Tester Auto/Manual Raging with Analog Bar Graph
US$32.99 US$51.99
0
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