HughT
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Κιτ επαγγελματικών φορητών πάνελ ηλιακού ηλεκτρισμού 250W Max με διπλό DC USB φορτιστή σόλαρ πάνελ ημιευέλικτο κρύσταλλο ηλιακής ενέργειας με ελεγκτή ηλιακής ενέργειας 60A / 100A
US$41.99 US$50.99

Ερ: Could you please provide a real specification? The incident power from the sun on this panel at the equator would be about 125W and with less than 25% efficiency, the output will be less than 30W. If you want people to buy, please stop telling lies.

Ερώτηση από HughT επί 2021-04-20 07:13:33

bobheadrick Yes, the spec's are highly questionable. The 250W is meaningless, perhaps refers to the maximum output of the 60 or 100 Amp controller (also highly suspect). The spec's mention short circuit current of 2A for the panel, and perhaps 6V OC voltage. At best this may be a 5-10W panel.

2021-05-13 01:19:27 Βοηθητικός (25)
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HughT 22/06/2021
These are what they say! The length is about right. One thing I have found is that the contacts don't like being repeatedly connected and disconnected. They get loose after a while.
40 τεμάχια καλωδίων θηλυκού-θηλυκού 10cm
US$4.99 US$3.99
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HughT 14/06/2021
The display arrived fairly quickly and seems to be working fine. So far it just does what it says.
Οθόνη αφής TFT LCD 2.8 ίντσας ILI9341 ανάλυσης 240x320 με θύρα σειριακής επικοινωνίας SPI
US$17.24 US$23.99
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HughT 22/06/2021
These seem good enough quality and look as if they should be sufficiently robust and easy to use.
DANIU 10 τεμάχια Στρογγυλό Μεγάλο Μέγεθος Μόνου Στηρίγματος Κλιπ Απόκλιση Δοκιμής για Ηλεκτρονική Δοκιμή
US$6.92 US$7.99
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HughT 24/02/2021
Just as described. A slightly odd range of values but useful all the same.
660Pcs 33 Τιμές 20 Κάθε 1206 SMD Resistor Kit Assorted Kit 1ohm-1M ohm 1%sample Kit
US$5.99 US$14.99
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HughT 24/02/2021
These seem to be good enough quality and good value for money.
100pcs SS12d00G4 2 Gear 3 Pin Toggle Switch Διακόπτης Διακόπτης Διακόπτης On-Off Μήκος Λαβής 4mm
US$3.66 US$3.59
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HughT 22/02/2021
This seems to be a good idea for a product but there were definite quality issues. One of the SMA connectors was deformed and had to be bent straight to avoid damaging connectors by forcing them on. None of the ground connections of the SMA connectors was soldered - only the signal pins. This means that the ground connections were made just by the ground tabs being held against the PCB. The 10dB attenuator is a PI network but the top resistor is made up of two different valued resistors to keep them in the E12 series. This is not a good idea as the added inductance degrades high frequency performance. The 20dB attenuator is two 10dB PI networks cascaded with the two parallel resistors in the middle combined into one so that the total network is M shaped. Again the resistors in the two sections are slightly different to allow E12 values but in this case the high frequency impact shouldn't be as severe. The 30dB attenuator is a similar to the 20dB one in having the five resistors in an M shape but it isn't made up of two PI networks. It just seems to be a combination of resistors that gives approximately correct input and output impedance and attenuation. The first section has a much lower attenuation than the second. So, overall the design is acceptable for many uses but the production quality is poor.
DC-4.0GHz Σταθερή έναπτυσσόμενη προσκόλληση RF Radio Frequency
US$13.79 US$11.99
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HughT 20/02/2021
It's a pity you only get one and not five as shown in the photo but it seems fine.
Ασύρματος αντάπτορας RP-SMA θηλυκό σε RP-SMA θηλυκό για ασύρματη συσκευή Walkie Talkie
US$6.92 US$7.99
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HughT 20/02/2021
These are not 150mm or 15cm as stated in the description. The ones I got were quite a bit shorter (about 12cm) and this makes them somewhat difficult to use for my application. This is too big a difference to be a manufacturing deviation.
Αντάπτορας SMA αρσενικό σε SMA αρσενικό μεεπεκτεινόμενο καλώδιο - 5τμχ.
US$9.80 US$23.19
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HughT 20/02/2021
Seem to be good quality and lots of them.
P100-E2 100Pcs Dia 1.36mm Μήκος 33.3mm 180g Spring Test Probe Pogo Pin Tool
US$12.69 US$13.99
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HughT 20/02/2021
These seem to work well, certainly up to 1GHz. I haven't been able to measure their properties beyond that.
5PCS/10PCS Αρσενικό SMA RF Αντισταση Αντικατάσταση Κενό 50 Ohm Terminator Για FPV RC Drone
US$17.31 US$17.99
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HughT 18/06/2019
It works fine but the wires are very short and quite fine - so not so easy to work with. As others have said, it doesn't give the full 10W but it should do for what I want.
5W 10W DC12V COB LED DIY Chip Board Panel 120X10mm with Power Supply Driver
US$3.37 US$5.05
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HughT 01/07/2019
The board seems to be good quality and I was able to upload some of the test sketches from Teensyduino. So far, all is good.
Teensy++ 2.0 Compatible USB AVR Development Board For ISP AT90USB1286
US$10.99 US$14.99
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Dtech DT-5010 USB to RS232 Serial Port Adapter
US$12.97

Ερ: Does it come with the cable shown in the pictures?

Ερώτηση από HughT επί 2018-12-05 11:47:26
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HughT 07/02/2018
So far, this does what it is supposed to do. There are buttons for switching each channel on and off individually and buttons for turning all channels on and off together. There are some niggles. A minor point is that the relay clicks are a bit loud when it switches. A more important point has already been mentioned, that if you turn the power on and off again, the initial state cycles through 1 channel on, two channels on, three channels on, all four channels on. It would be better if it came up with no channels on or the last on state.
Ασύρματος διακόπτης φωτισμού με 4 κανάλια ON/OFF AC220V Πομποδέκτης ασύρματου χειριστηρίου λάμπας
US$13.85 US$14.99
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