In The Lab With Jay Jay – October 28, 2023 – ALKOY Capacitor Discharge Pen Teardown

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This post is part of my video blog: In The Lab With Jay Jay.

Silly Job Title: Electron Herder

This video is a teardown of the ALKOY Capacitor Discharge Pen which I did for YouTube user t1d100 who asked me about it over here: Demo of the ALKOY Capacitor Discharge Pen | In The Lab With Jay Jay.

I made a bunch of mistakes while making this video, so please bear with me. I tried to add some captions to explain things when I went wrong.

The discharge pen that I have was purchased from Amazon Australia here: 1000V Portable Capacitor Discharge Pen High Voltage Quick Discharging Tool Constant Discharge Pen Electronic Repairs Discharge Pen ALKOY.

There seems to be a similar product available from Amazon USA here: YEKMLCO Capacitor Discharge Pen Fast Discharging High Voltage 1000V Repair Tool Discharger for Electronic Safety Intelligent (affiliate link).

In the video you can watch me break this thing open. I didn’t exactly know how to do it, and I permanently damaged the device while opening it. In the end I wasn’t 100% sure what the safe and proper way to open these things really is. Giving it a mighty pull might work, otherwise you will need to leverage off some friction locks.

Before I broke the device open I tried to measure the resistance across its probes, but all three measurement devices reported open circuit. The device doesn’t seem to engage the resistor until it detects a voltage.

Eventually I got the device open, you can see some photos of the circuit board below, and I make some attempt to identify the components.

The MB10F on the top is a bridge rectifier, the M7F in the middle is a rectifying diode, and the resistor at the bottom is 2MΩ. In the video I say that the resistor is a “two ohm resistor”, but it is actually a “two MEGA ohm resistor” (I knew that, I just misspoke).

I’m not 100% sure what the CS01N100 A3R is, but it seems than an CS01N100 A4R is a silicon N-Channel Power MOSFET, so I think that’s probably what that is.

As I broke this device during the teardown I have purchased myself a replacement device for AU$23.02.

In the video I use the following equipment (affiliate links where possible):

Mini Digital Tweezers Miniware DT71 Mini Digital Tweezers Smart SMD LCRDVF Tester Multimeter Signal Generator for Measuring Components
SMD Digital Tweezers UNI-T UT116A Digital Tweezers Smart SMD Tester Electrical Multimeter Resistance Capacitance Continuity Diode Test Meter
Component Tester FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester 10MS/s Sampling Rate 500kHz Bandwidth Support Diode LCR Detect Signal Generator
Soldering Station Horusdy 2in1 Soldering Station Solder Iron Rework Hot Air Blower Digital SMD Display + 11 Tips, 4 Nozzles & Tweezer Set
Mini Screwdriver Set Legion Tools Precision Mini Screwdriver Set 11pc Jeweller Laptop Phone Watch Repair Tool
Repair Mat Kaisi Heat Insulation Silicone Repair Mat with Scale Ruler and Screw Position for Soldering Iron, Phone and Computer Repair Size: 13.7 x 9.8 Inches
Desoldering Pump Kaisi Professional Solder Auxiliary Tool 6 piece double-sided repair tool with Desoldering Wick & Desoldering Pump
Craft Knife Precision Craft Knife Set 52pcs Professional Razor Sharp Knives for Art, Hobby

In the video I have trouble with the connections into the DSO-TC3, the connections are documented here: FNIRSI DSO-TC3.

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