kraki
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kraki 17/05/2023
The device use YD7377 power amplifier and it's rated MAX power output is 30W an RMS output is 20W by datasheet. The integrated power supply use converter which vibrate with whole case and add 50HZ hum to output sound. The power switch is connected to 220V AC input, doesn't control device connected to 12V DC. The wire to antenna leads over converter and can add noise when device is used with 220V AC. Overall is not bad versatile device to garden for this price.
HIFI 220V 12V CH2.0 Οικιακός Αυτοκινήτου Ενισχυτής Bluetooth Αναλογία σήματος προς θόρυβο 90BP Με Τηλεχειριστήριο
US$60.05 US$62.99
2
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kraki 20/05/2021
The controller is pure low cost PWM regulator. The 5V USB port is capable to delivery only 0,5A! The included cable is really thin and 2A current will burn it, don't try use it with load higher then cca 20W. The panel itself has USB-A and USB-C connector with same 0,5A limitation. The panel can delivery max. 20W. Overall - bad combination of components, the
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
23
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kraki 19/06/2021
This is the second kit, the first one had faulty controller. The controller has set-up three battery types, the b2 is configured to be used with LiIon battery. The manual has incorrect information about it. I measured solar panel, it's max. 25-30W of power. The panel has protective diode and can be safely connected in parallel with another one. The USB port on solar panel and controller can delivery 0,5A at 5V. Overall the kit is suitable for devices with small power consuption.
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
7
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kraki 09/11/2022
The microphones are solid and little heavy but balanced. The sound is natural and speech is clear. The noise from mics is on low level, it's good. The noise become problem with BT, it's add interference noise and it is noticeable in silent passage. The receiver and both mics has charged cables in box. I don't recommend charge the receiver/mic during use, additional noise is added based on quality of charger. In overall, the mics are good value for bucks, i can recommend it to small parties.
Σύστημα καραόκε διπλού επαναφορτιζόμενου ασύρματου μικροφώνου ARCHEER Professional UHF δυναμικό σετ μικροφώνου με δέκτη Bluetooth
US$68.13 US$70.99
0
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kraki 19/01/2022
The good scope for beginners. It comes with only one probe, two BNC with crocks adapters and USB cable. It has simple and user friendly menu and controls. The scope is lightweight and size is moderate and nicely fit to work bench. It has many advanced functions from more expensive scopes. The SW still has some glitches but updates improve usability and fixing bugs. The DSO2D10 can be easily hack to D15 model with 150MHz range. The scope is slower in some scenarios, the HW is not so powerfully to handle it smoothly. The scope can be connected to PC via USB and bundled software is usable. The connection to PC over USB and controlling the scope using the SCPI command is nice bonus. In conclusion, the scope is great device for this price.
Hantek DSO2D10 Ψηφιακό οσκιλοσκόπιο 2CH + 1CH Digital Storage 1GS / s Ρυθμός δειγματοληψίας Εύρος ζώνης 100MHz Διπλό κανάλι οικονομικό οσκιλοσκόπιο με πηγή σήματος (AWG)
US$229.99 US$322.99
1
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kraki 19/01/2022
This welding machine makes solid light spot when welding the sheets 0.1 and 0.15mm to batteries. It supposed to occasionally job, not for big battery pack welding. I use lead-acid battery as power supply. I also print plastic box on 3D printer to avoid short circuits.
Φορητή μηχανή συγκόλλησης κυκλωμάτων PCB Εξοπλισμός συγκόλλησης σημείου συγκόλλησης για μπαταρίες 18650 26650 12V
US$21.84 US$34.99
0
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kraki 22/12/2021
This is one of most cheap 1/16 RC. It doesn't have liner speed and drive control. I bought it for kids as toy for playing on garden. It's simply to control and maintenance. The remote controller is from light cheep plastic and man should be careful to left it on ground or not to fall from hands. For the price it's good toy for kids.
Flytec 6029 1/16 2.4G RWD RC Car Electric Off-Road Vehicle RTR Model
US$56.58 US$58.99
0
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kraki 03/11/2021
The mini saw is compact, plastic parts are sturdy, the vibrations are not strong. The motor heating is not bad, bat i doubt if it can work 10 mins continually (i can also hope that has overheating protection). The plate with chain have to be adjusted after few cuts, because . This saw doesn't have auto oiling, oil gun is needed. I order it with two batteries for work without waiting to battery charging. The speed is not adjustment, just on/off, the description on page is wrong. I also mission some safety lock button, i have to remove battery after work. The screwdriver is both side and plastic handle is frail, it cracks after the first use. Shipping from CZ warehouse was fast, about 3 days.
550W 21V 4'' Μίνι ασύρματο ηλεκτρικό αλυσοπρίονο για ξυλουργική με μία χειρολαβή και 2 μπαταρίες
US$79.68 US$82.99
0
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kraki 01/11/2021
Set of basic resistors, nothing more, nothing less.
Geekcreit® 600 τεμάχια 30 Είδη Τιμή 1% 1/4W Μεταλλική Αντίσταση Ταινίας Συλλογής 20 τεμάχια ανά Τιμή
US$6.99 US$8.69
0
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kraki 01/11/2021
Pack of different prototyping boards for good price.
Πλακέτα πρωτότυπου PCB με διπλή πλευρά Geekcreit® 40 τεμαχίων FR-4 με διάμετρο 2,54mm
US$9.99 US$15.99
0
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kraki 15/09/2021
Small, simple and useful BT thermometer with humidity sensor too. I already have three devices and i extend collection to have each for every room. I use it with ESP32 home automation for heating regulation.
3PCS XIAOMI Mijia BT Bluetooth Thermometer 2 Wireless Smart Electric Digital Hygrometer Thermometer Work with Mijia APP
US$29.39 US$40.99
0
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Φορητή θερμογραφική κάμερα XINTEST HT02, ψηφιακή υπέρυθρη κάμερα, δοκιμαστής θερμοκρασίας με έγχρωμη οθόνη LCD 2,4 ιντσών
US$169.99

Ερ: Can it be used to detect overheating (hotspot) of photovoltaic modules?

Ερώτηση από BG433133521 επί 2021-08-26 03:08:25

kraki Yes, it can be used. Beware, there is shift of optical and infrared camera.

2021-09-05 06:19:41 Βοηθητικός (0)
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kraki 03/09/2021
The board delivered with printer is 1.1.5 with Merlin firmware 1.18 (old). The assembly with bed calibration takes me about 1,5 hour. I don't use manual, i complete printer with alternative steps from youtube video where some calibration steps has been mentioned during assembly. The default standard printing settings give good quality results. I'm using the glass plate which should be more flat and durable. The steps motors are silent, the fans are noisy, i really recommend using separate room for printing. The fans on lower speed generate pitch noise, i hope that is not indication of future fan failure. I can recommend this printer for occasionally printing for home. The rate of value/price is really good. The shipping was really fast, from CZ to CZ during 2 days.
Creality 3D® Customized Version Ender-3Xs Pro Εκτυπωτής 3D with V4.2.2 Silent Mainboard+Πλατφόρμα γυάλινης πλάκας+Magnetic Removable Sticker Kit Μέγεθος εκτύπωσης 220x220x250mm
US$305.89 US$302.99
0
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kraki 28/05/2021
It was well packed using bubble-wrap. I will use it as spare part for JCD 8898 hot air gun.
Θερμαντικό στοιχείο κεραμικού κέρματος JCD που θερμαίνει θερμικό στοιχείο εργαλείων συγκόλλησης και επισκευής για το σταθμό κόλλησης 8898 858D 8858 8586
US$14.94 US$19.99
0
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kraki 20/05/2021
Simple, basic but powerful combination of hot air heater and soldering iron. It's small and can be mounter to wall - save the space on table. The plastic of gun and iron is not hot, the cables are soft and long enough. The heating takes about 30s, and cold down of air gun is started after the gun is put into the base station. Stand for soldering iron is almost unusable - very light and unstable, i don't use it. The independent power switches and temperature control. The temperature can be calibrated. The great device for your money. The delivery was really fast from local warehouse.
JCD 8898 2 σε 1 750W Συγκολλητικός σταθμός Θέρμανση θερμού αέρα LCD Ψηφιακή οθόνη Soldeirng Σίδερο συγκόλλησης Επαναφορά σταθμού για κινητό τηλέφωνο BGA
US$57.74 US$52.99
0
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kraki 05/05/2021
The main advantage is local control and storage. The support of two streams and ONVIF protocol is handy for connecting to any surveillance system. The mobile app is simple but functional. The video quality is good enough for security camera. The human detection and tracking work correctly. The one of the antennas is fake, it's just piece of plastic. The plastic is sturdy but camera is not sealed, it better to have camera under roof. It's good choice for this price.
Κάμερα ασφαλείας Tuya RPP06 1080P PTZ ασύρματης σύνδεσης WiFi IP κάρτας TF Tuya Smart Home Voice Intercom Night Vision αδιάβροχη Pan Tilt IP Camera
US$45.14 US$47.99
0
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kraki 05/05/2021
Simple a functional. Configuration is easy over web page. Power consumption is small, powering by battery is not problem. The wifi range is average as anybody expect.
BlitzWolf® BW-NET4 Wireless Repeater 300Mbps USB WiFi Repeater Φορητός Ενισχυτής Σήματος WiFi Signal Extender Μαύρο
US$22.99 US$23.99
0
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kraki 22/07/2020
Small and powerful battery charger with power supply function. Nice feature is discharging back to source battery and checking the battery just by plugging it to output. Great device for the few bucks.
ΕργαλειοθήκηRC & URUAV M600 150W 10A DC MINI Smart LCD 1-6S Lipo Battery Balger Charger Charger With Voltage Servo Checker Receiver Signal Tester Quick Charger Function
US$35.64 US$37.99
0
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kraki After 3 moths stop working. The touch controls stop working, the charger randomly select any item. It's useless now. I change my recommendation, DON'T BY IT, the charger with classic buttons will be better.

kraki 22/07/2020
Small and powerful battery charger with power supply function. Nice feature is discharging back to source battery and checking the battery just by plugging it to output. Great device for the few bucks.
ΕργαλειοθήκηRC & URUAV M600 150W 10A DC MINI Smart LCD 1-6S Lipo Battery Balger Charger Charger With Voltage Servo Checker Receiver Signal Tester Quick Charger Function
US$35.64 US$37.99
0
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