Julian's Electronics on Odysee

Asperx 65W USB PD Power Bank Review

Thu, 28 Nov 2024 15:47:45 GMT

Review of the Asperx AX2065 power bank. Featuring two USB type C ports and a type A port, it has a maximum charge/discharge rate of 65W. It comes with a 65W charging cable and has a very nice display with charge level in percentage and separate input and output power meters.

https://www.amazon.co.uk/dp/B0D8T8H733?maas=maas_adg_82200EC6E330B1B8D3B4DD40A29B7CD2_afap_abs&ref_=aa_maas&tag=maas

A 20% off code that lasts until December 2: AXDTDLP3
...
https://www.youtube.com/watch?v=BCNLH3sVrQI

Lithium Ion Super Capacitors

Tue, 29 Oct 2024 16:34:43 GMT

Testing LIC and LIB series lithium ion super-capacitors from Taiwanese company CDA.

Product Data Sheets:
https://en.cda-cap.com/index.php/product/lic/
https://en.cda-cap.com/index.php/product/lib-series/

Buy LICs on AliExpress:
https://www.aliexpress.com/item/1005003694425219.html
https://www.aliexpress.com/item/1005006849775786.html

Other items shown:
https://www.aliexpress.com/item/1005007419793087.html
https://www.aliexpress.com/item/1005007168934730.html
https://www.aliexpress.com/item/1005004045704733.html
https://www.aliexpress.com/item/1005006101475633.html
...
https://www.youtube.com/watch?v=hNC85s7LxwI

Ideal Diodes from AliExpress

Fri, 18 Oct 2024 14:01:54 GMT

A look at a number of ideal diodes bought from AliExpress. Includes a look at the datasheets.
...
https://www.youtube.com/watch?v=hR2Mx9liUDs

JA Solar 440W Bifacial Solar Panel

Sun, 13 Oct 2024 12:55:13 GMT

This solar panel was generously donated by my local friendly solar installers. It does have a crack running the full length of the front glass, but it's still delivering over 12 Amps in full sun.
...
https://www.youtube.com/watch?v=ooM80srcql0

Voltage Controlled Relay gets Ideal Diode

Thu, 10 Oct 2024 15:48:24 GMT

An improvement to my Give n Take system which lets one battery charge another battery.
...
https://www.youtube.com/watch?v=PHJbWg0mGuo

Xtar 18650s have 4000mAh Capacity

Fri, 04 Oct 2024 12:27:23 GMT

Testing the capacity of new Xtar 18650 cells with a rating of 4000mAh. Also checking some 21700 cells rated at 6000mAh.

https://www.xtar.cc/battery.html
...
https://www.youtube.com/watch?v=lNivTokxep4

Battery Testers Analysed

Tue, 24 Sep 2024 13:23:17 GMT

Battery testers tested. Including BT168D, BT168 Pro, BT189 and BT168Max. Why do some of these testers latch the voltage measurement?
...
https://www.youtube.com/watch?v=GbKLPW3ma-c

Supercapacitor Playground

Thu, 12 Sep 2024 19:22:19 GMT

Playing with supercapacitors
...
https://www.youtube.com/watch?v=XpUChpp5iOs

Atorch DT20 has New Firmware

Thu, 05 Sep 2024 17:49:01 GMT

Atorch have updated the DT20 Power Meter with new firmware version 1.07.
This fixes my main gripe in that you can now see whether the current flow is positive or negative. Also, the over voltage and low voltage alarms have been separated from the battery 100% and 0% voltages.
...
https://www.youtube.com/watch?v=lAdJyMd_t5o

Coulometers Tested TK15 H56C

Thu, 22 Aug 2024 18:07:21 GMT

Detailed description and evaluation of two different coulometers - the TK15 and the H56C.

TK15:
https://www.aliexpress.com/item/1005005297734867.html

H56C:
https://www.aliexpress.com/item/1005006168944452.html
...
https://www.youtube.com/watch?v=rAj6r5kcgJg

CHEAP Lidl Parkside Cordless Engraver 4V CHEAP

Fri, 16 Aug 2024 17:04:55 GMT

Got this engraver from Lidl for a very low price.
...
https://www.youtube.com/watch?v=FaEcb_QAW6M

Sodium Battery with Voltage Display

Thu, 15 Aug 2024 12:39:47 GMT

My 8S sodium ion battery now has active balancers and voltage displays.

Heltec display:
https://www.aliexpress.com/item/1005006697823220.html

3S/4S Balancer:
https://www.aliexpress.com/item/1005005672839228.html
...
https://www.youtube.com/watch?v=ohAPRMhZBmU

Spot Welding 32140 Sodium Ion Cells using Supercapacitors

Tue, 30 Jul 2024 16:50:14 GMT

I'm building an 8S sodium ion battery to power the lights in my shed.

Sodium ion cells:
https://www.aliexpress.com/item/1005006144187633.html
...
https://www.youtube.com/watch?v=oEHl-HxAnKg

Atorch DT20 DC Energy Meter with WiFi Tuya

Thu, 25 Jul 2024 16:30:50 GMT

A DC energy meter with remote monitoring.

https://www.aliexpress.com/item/1005007168934730.html
...
https://www.youtube.com/watch?v=VEQWkEoxd1M

ZK-SJ30 Buck Boost 30A Converter uses LT8705

Wed, 17 Jul 2024 14:49:42 GMT

A bigger version of the SJ20 buck boost converter.

Described as a 30A unit with maximum power limit of 700W. For high current / high power use the cooling must be enhanced with a 12v fan.

Notes:
The SJ30 appears to have an input current limit of 24.5A
The SJ20 appears to have an input current limit of 18.8A
These limits were observed using a 13.5v supply.
...
https://www.youtube.com/watch?v=6GnoQxTYjVI

Fnirsi HRM-10 Internal Resistance Tester

Thu, 11 Jul 2024 15:39:25 GMT

An precision internal resistance and voltage tester with 4-wire probes and an easy-to-read LCD display.
The voltage measurement has 4 decimal places of precision and the resistance measurement has a precision of 0.01 milliohms.

AliExpress: https://s.click.aliexpress.com/e/_oE6sjyu
Amazon: https://www.amazon.com/FNIRSI-Resistance-Tester%EF%BC%8CBattery-Batteries-Automotive/dp/B0D6FPBGCX
Code: FNUK22
Time: July 11th - July 24th
...
https://www.youtube.com/watch?v=qOUY-k61pEI

Xtar VX4 Battery Charger Capacity Tester

Tue, 09 Jul 2024 16:08:03 GMT

The VX4 can charge multiple battery types including lithium ion 1.5V, nickel metal hydride 1.2V as well as lithium ion 3.7V and lithium iron phosphate 3.2V

It's the first charger that can grade (test the capacity of) lithium ion 1.5 volt cells.

VX4 charger in aliexpress store: https://vi.aliexpress.com/item/1005007121040816.html?gatewayAdapt=glo2vnm
XTAR official website link: https://www.xtar.cc/product/xtar-visible-mixer-vx4-charger.html
...
https://www.youtube.com/watch?v=rdPcA-8b_1U

Junctek BL105F Coulometer

Sat, 29 Jun 2024 10:46:30 GMT

This unit counts coulombs flowing into and out of a battery.
Coulombs are a measure of charge in amp seconds - this device displays charge in amp hours.

https://juntek.aliexpress.com
https://www.aliexpress.com/item/1005006756222128.html
...
https://www.youtube.com/watch?v=_llSk8IfwiU

5% Better than Specified - 105Ah LFP Battery Tests

Tue, 25 Jun 2024 15:41:11 GMT

Hakadi Battery 105Ah prismatic LiFePO4 (EVE) cells tested.

https://hakadibattery.com/products/eve-lf105-lifepo4-3-2v-105ah-battery-grade-a-prismatic-cell-for-boat-rv-ev-solar-system

Capacity test results:
Cell 1 - 112 Ah
Cell 2 - 111.1 Ah
Cell 3 - 111.5 Ah
Cell 4 - 110.8 Ah

Internal resistance:
All cells - 0.29mΩ to 0.30mΩ - at all states of charge (newly supplied, fully charged and fully discharged)
...
https://www.youtube.com/watch?v=kv6pb3BG-w0

Hakadi Battery 105Ah LiFePO4 Prismatic Cells

Sat, 08 Jun 2024 11:03:42 GMT

Building a compression rig for these 105Ah (336Wh) prismatic LiFePO4 3.2V EVE cells. Also a couple of quick internal resistance tests.

https://hakadibattery.com/products/eu-stock-eve-lf105-lifepo4-3-2v-105ah-battery-grade-a-prismatic-cell-for-boat-rv-ev-solar-system
...
https://www.youtube.com/watch?v=Aig5JGZ9FIU

Mosquito Lamp

Mon, 03 Jun 2024 14:59:32 GMT

A mosquito killer lamp teardown. Runs for an hour or so on a lithium 18650 1200mAh cell. Charged from 5V USB. Contains a lithium cell charger chip and a high voltage generator.

https://www.aliexpress.com/item/1005006344967501.html
...
https://www.youtube.com/watch?v=HhxFmxUln2E

30A DC Circuit Breaker Teardown

Wed, 15 May 2024 13:41:50 GMT

Full teardown of a DC circuit breaker rated 30A.

https://www.aliexpress.com/item/1005006784397399.html
...
https://www.youtube.com/watch?v=Brail6ysxOY

Sodium Ion Batteries and Heltek Balancers

Sat, 27 Apr 2024 11:03:34 GMT

The battery stuff I'm playing with right now.

https://www.aliexpress.com/item/1005005902860920.html
https://www.aliexpress.com/item/1005005497090720.html
...
https://www.youtube.com/watch?v=C1Xtq1xRzgA

Battery using Different Grades of Yinlong LTO Cells?

Fri, 19 Apr 2024 14:58:08 GMT

Can I build a 3-cell battery using different grades of Yinlong LTO cells?

Buy grade-A Yinlong LTO cells from: https://hakadibattery.com
...
https://www.youtube.com/watch?v=tzzcffcggJw

Xtar VC8S Battery Charger Tested

Fri, 12 Apr 2024 13:07:31 GMT

This 8-bay charger supports lithium ion and nickel metal hydride cells, and can charge up to 2 cells at 3 amps, up to 4 cells at 2 amps, and up to 8 cells at 1 amp. LiFePO4 can also be charged if the charger is in Storage mode. Sodium ion can also be mostly charged in Storage mode.
Cells can be graded (charged, discharged and capacity tested, then charged again) in Grad mode.

Amazon UK link: https://amzn.to/3TV43i5

Things I found out after I made this video:

In storage mode, nickel metal hydride is first charged fully, then discharged to 1.29 volts.

In storage mode, sodium ion is treated as NiMH until it reaches 2 volts. Between 2 volts and 2.5 volts, sodium ion is treated as a faulty lithium cell and will periodically flag an error. Above 2.5 volts, sodium ion is charged normally up to 3.65 volts.
...
https://www.youtube.com/watch?v=5d5wAhSJbwo

Modular Shed - Nail Plates

Mon, 08 Apr 2024 15:58:46 GMT

Wow, summer. Looks nice doesn't it?
...
https://www.youtube.com/watch?v=63mk08up6VE

Shed Update April '24

Wed, 03 Apr 2024 17:05:30 GMT

What is going on in the modular shed this month?
...
https://www.youtube.com/watch?v=zSJZNWQCRx0

Fnirsi SWM-10 Spot Welding Machine

Wed, 27 Mar 2024 15:45:10 GMT

A review of this handy desktop spot welder.

Fnirsi SWM-10: https://s.click.aliexpress.com/e/_oCJDJ8W
...
https://www.youtube.com/watch?v=Ua9z6Jw53OQ

PCIE Meltdown

Thu, 21 Mar 2024 16:44:45 GMT

Why is there no standard polarity for PCIE power connectors? This cheap PCIE power cable caught me out and killed an Antminer control board.

https://www.monolithicpower.com/en/mp1484.html

These links very kindly provided by a Patron:

https://superuser.com/questions/849265/is-there-a-difference-between-8-pin-eps12v-and-pci-e-connectors
https://qph.cf2.quoracdn.net/main-qimg-d0b098e598dd5de28261e6323a1fe572
...
https://www.youtube.com/watch?v=dYmxnGthXT4

Pure Nickel or Nickel Plated Steel?

Thu, 14 Mar 2024 17:29:41 GMT

Is pure nickel strip worth the price? Four times more expensive but certainly not a quarter the resistivity.

https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity
https://www.aliexpress.com/item/1005004681739268.html
https://www.aliexpress.com/item/1005005197511586.html
https://www.aliexpress.com/item/1005006151499051.html
...
https://www.youtube.com/watch?v=PzhOi4-m034

Vehicle COB Lights 12V to 85V

Mon, 11 Mar 2024 17:17:17 GMT

These LED lights include a buck converter.

https://www.aliexpress.com/item/1005005972589989.html
https://www.aliexpress.com/item/1005005806759882.html
https://www.aliexpress.com/item/1005005511135545.html
https://www.aliexpress.com/item/1005004460658096.html
https://www.aliexpress.com/item/1005006445372224.html

http://tpower-ic.com/product-61320-53110-144234.html
...
https://www.youtube.com/watch?v=U1oTS30p_DM

Dabbsson DBS1300 Portable Power Station Review

Sat, 09 Mar 2024 12:27:03 GMT

Very interesting LFP power station with EV grade semi solid state cells, super fast charging and feature-packed App.

DBS1300: https://amzn.to/3TbBT1U
£100 off code: BPO7TTKZ
...
https://www.youtube.com/watch?v=quZa4kv_fiQ

The BT189 Battery Tester is no Voltmeter

Wed, 06 Mar 2024 15:23:59 GMT

Because of its latching action

https://www.aliexpress.com/item/1005006117710549.html
...
https://www.youtube.com/watch?v=oFkUuGRWDvs

Kaiweets KTI-K01 Thermal Imaging Camera Review

Mon, 26 Feb 2024 16:45:04 GMT

Review of Kaiweets new thermal imaging camera with 256x192 sensor and 3.5" touch screen.

15% off code: JI15
(Sitewide at Kaiweets.com and it never expires.)
Buy from: https://kaiweets.com/products/kti-k01

10% off code (Amazon US): BW7PR927
$100 coupon: Apply from product page
(Save 10% plus $100 in total)
Date of expiry: 2024-4-30
https://www.amazon.com/dp/B0CKP5KKMW
...
https://www.youtube.com/watch?v=2r__rbagl4Y

Building a Modular Shed

Tue, 20 Feb 2024 16:55:44 GMT

Building my modular garden shed - from the beginning.
Originally recorded in 2020.
...
https://www.youtube.com/watch?v=BwiDb47tTLg

Boost and Buck Converters DPX800S and DPQ9010

Fri, 16 Feb 2024 16:03:20 GMT

High voltage (100V) and high current (10A) boost and buck converters.

https://www.aliexpress.com/item/1005005603931865.html
https://www.aliexpress.com/item/1005005594624086.html
https://www.senliwell.com/news/267.html
...
https://www.youtube.com/watch?v=5WbQr1NcwXQ

Fnirsi FNB58 USB Fast Charge Tester

Mon, 29 Jan 2024 16:57:08 GMT

Versatile USB test instrument.
Available here: https://s.click.aliexpress.com/e/_oCDsPGs

Measures voltage, current and power with data logging functions. Checks and reports all the fast charge options of your power banks. Listens to PD communications and shows the relevant capabilities. Checks for e-marker chip in 5A type-C cables. Measures USB cable resistance. Includes a full function USB oscilloscope.
...
https://www.youtube.com/watch?v=dD9JUKpBsfI

The ZK-S4 Boost Converter works down to 2V

Thu, 25 Jan 2024 15:36:55 GMT

Boosting the voltage from a single LTO cell to do something useful with it.
...
https://www.youtube.com/watch?v=4KhxGwfD2Yk

100A Relay Coil Overheat Prevention

Wed, 17 Jan 2024 15:12:17 GMT

This motorcycle starter relay is only intended for short duration use. Here's a technique to allow longer duration operation.
...
https://www.youtube.com/watch?v=oofvG4sh_to

Lithium Titanate Cells - an Introduction

Sat, 13 Jan 2024 11:06:52 GMT

What are lithium titanium oxide cells? Where do they come from and what are they used for?

Hakadi LTO Cells: https://hakadibattery.com/products/hakadi-lto-2-4v-40ah-original-grade-a-brand-new-rechargeable-lithium-titanate-batteries-for-diy-solar-car-audio-power-grid
Yinlong LTO Cells: https://hakadibattery.com/products/yinlong-2-3v-40ah-grade-a-lto-cells-brand-new-66160-lithium-titanate-battery-for-car-audio-rv-ev-solar

Yinlong website: https://www.yinlong.energy/
Yinlong LTO cell safety video: https://www.youtube.com/watch?v=VORpNAHmFSM
Electric bus: https://en.wikipedia.org/wiki/Electric_bus
...
https://www.youtube.com/watch?v=CRjK1jtoElg

Xtar Dragon VP4L Plus Battery Charger

Sat, 06 Jan 2024 14:52:05 GMT

Review of this four slot lithium ion and nickel metal hydride cell charger.

Product links:
https://www.amazon.co.uk/Rechargeable-XTAR-batteries-Professional-Batterys-Black/dp/B0BXCF4FRR
https://www.xtar.cc/product/XTAR-VP4L-Plus-Charger-214.html
...
https://www.youtube.com/watch?v=qQkJE7_6rJ0

Smart Active Balance Module

Thu, 14 Dec 2023 16:46:42 GMT

The smart active balancer from 100Balance

Sodium ion cells from:
http://www.evpromax.com

Active balancer links:
https://www.aliexpress.com/item/1005006226906519.html
https://www.aliexpress.com/item/1005006043488118.html

Data sheets:
https://semic-boutique.com/wp-content/uploads/2021/01/EG27324.pdf
https://datasheet.lcsc.com/lcsc/2012141235_Chipanalog-CA-IS3721HG_C528650.pdf
https://datasheet.lcsc.com/lcsc/1811071713_3PEAK-TP8485E-SR_C94206.pdf
https://datasheet.lcsc.com/lcsc/1811151441_GATEMODE-BM8563_C269877.pdf
https://datasheet.lcsc.com/lcsc/1810101510_EG-Micro-EG3001_C81708.pdf
http://www.icgan.com/uploadfile/pdf/agmsemi/rxtxmos/AGM311MN_datasheet_v2.2.pdf
...
https://www.youtube.com/watch?v=dOGQ7QbWGlw

Active Balancer Modules

Wed, 13 Dec 2023 16:58:59 GMT

These are the non-smart active balancers from 100Balance.

Sodium ion cells from:
http://www.evpromax.com

Active balancer links:
https://www.aliexpress.com/item/1005006226906519.html
https://www.aliexpress.com/item/1005006043488118.html

Data sheets:
https://semic-boutique.com/wp-content/uploads/2021/01/EG27324.pdf
https://datasheet.lcsc.com/lcsc/2012141235_Chipanalog-CA-IS3721HG_C528650.pdf
https://datasheet.lcsc.com/lcsc/1811071713_3PEAK-TP8485E-SR_C94206.pdf
https://datasheet.lcsc.com/lcsc/1811151441_GATEMODE-BM8563_C269877.pdf
https://datasheet.lcsc.com/lcsc/1810101510_EG-Micro-EG3001_C81708.pdf
http://www.icgan.com/uploadfile/pdf/agmsemi/rxtxmos/AGM311MN_datasheet_v2.2.pdf
...
https://www.youtube.com/watch?v=pfMIXV6ewI8

Sodium Ion Cells from Hakadi Battery

Fri, 08 Dec 2023 16:00:35 GMT

Some large format sodium ion cells and battery management systems (BMSs) from hakadibattery.com

https://hakadibattery.com/products/hakadi-sodium-ion-18650-3-0-v-1500mah-battery-original-rechargeable-cell-for-e-bike-power-tools-diy-12v-24v-48v-72v-battery-pack
https://hakadibattery.com/products/hakadi-sodium-ion-33140-3v-10ah-battery-na-ion-rechargeable-cell-for-cars-rv-ev-electric-bicycle
https://hakadibattery.com/products/hakadi-sodium-ion-3-0-v-battery-18ah-brand-new-rechargeable-na-ion-batteries-for-solar-energy-stoarge-boat-medical-equiment
https://hakadibattery.com/products/hakadi-4s-16s-sodium-ion-battery-smart-bms-for-diy-battery-pack?variant=41899722670285
...
https://www.youtube.com/watch?v=jA5pOqvPg54

New Product Peek

Mon, 04 Dec 2023 16:50:15 GMT

A quick look at some new items I've bought on eBay and Aliexpress.

https://www.aliexpress.com/item/1005006168244615.html
https://www.aliexpress.com/item/1005005297734867.html
https://www.aliexpress.com/item/1005004590744267.html
https://www.aliexpress.com/item/1005005444567955.html
https://www.aliexpress.com/item/1005005271971237.html
https://www.aliexpress.com/item/1005005315634941.html
https://www.ebay.co.uk/itm/305094832166
https://www.ebay.co.uk/itm/155711905976
...
https://www.youtube.com/watch?v=oN3BBJ707P0

Shed Condensation #shorts #shed

Sat, 02 Dec 2023 12:52:06 GMT

This is why I need to put covers on my electronics in the shed
...
https://www.youtube.com/watch?v=xCFru3lqfdM

Modular Shed Update - November '23

Thu, 30 Nov 2023 16:21:39 GMT

A very cold shed - zero degrees showing on the temperature display. Failed buck converter probably didn't like the solar panel open circuit voltage and has failed short. I've been testing Antminers on a range of voltages between 13.6V and about 11V.
...
https://www.youtube.com/watch?v=g-ZHhufVVDM

Dual BMS Problem for Sodium Ion Battery - Fixed

Thu, 23 Nov 2023 21:54:46 GMT

Using two BMSs (LiFePO4 and NMC) with a sodium ion battery is not without its problems. One such problem is overheating MOSFETs.
...
https://www.youtube.com/watch?v=p55WhCbtbyM

Voltmeter Ammeter Wattmeter Z3-20A

Sun, 12 Nov 2023 10:35:23 GMT

Self-powered voltmeter ammeter wattmeter with LED backlight. Input up to 200V and 20A (not yet tested).
...
https://www.youtube.com/watch?v=xT_9_Eavuaw

My First Sodium Ion Battery

Mon, 06 Nov 2023 16:30:41 GMT

A 4-cell (4S) sodium ion battery using 33140 cells from http://evpromax.com

Fitting a battery management system (BMS) from https://www.aliexpress.com/item/1005003070168586.html

The chip on the BMS is from BYD https://uelectronics.com/wp-content/uploads/2021/02/BM3451-BYDMicroelectronics.pdf
...
https://www.youtube.com/watch?v=daVtHPdMZKM