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More Philips Boombox Tinkering

new AA cells

Having recently fixed the Philips boombox CD player, we decided to review the battery compartment mod, done at least 20 years ago, and still working.

The original idea was to fill the battery compartment with 8x rechargeable D cells and arrange that they would be constantly trickle-charged while the mains lead was plugged in. The battery compartment’s positive terminal was connected via a current-limiting resistor to the power supply section of the PCB. This trickle charges the cells at about 10mA. This is enough to charge them up over a few days, but not enough to cook them.

Good quality branded rechargeable D-cells are relatively expensive…. about €10 a pop for a ~10Ah cell, so it’s about €80 to fill the battery compartment. Given that the thing is not used that often on battery, this was a bit much. So instead, 8x AA cells were used in holders, and soldered to the existing connections in the battery compartment. The cells were NiMH made by GP and rated at 1.2V, 1500mAHr. This mod was done, we guess sometime around 2000.

So today, ~25 years later, new cells were fitted and we measured the capacity of the original cells. Discharging at 200mA to a cutoff voltage of 0.9V, the original cells tested at 599mAHr…. about 40% of their original nameplate capacity. The new cells fitted are from Lidl and are rated at 2500mAHr.

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The Irish Embassy at 39C3

This Christmas saw the largest group ever travel to the Chaos Communication Congress, 39C3. A four-day conference that brings hackers and makers from across the world to Hamburg. https://events.ccc.de/congress/2025/infos/index.html

A collective of hackers and makers with ties to Ireland formed the “Irish Embassy” Assembly. A self-organised space where shared interests or projects gather to collaborate, learn, and share. Lots of our members joined in with the fun of this space to celebrate Type G power sockets and give out Tog stamps to hackerspace passports.

Our own Jeffrey gave lots of workshops in the Hardware Hacking Area this year, and fun with TOTA – Toilets on the Air, but that’s for another blog post.

Looking ahead, the Irish Embassy will be reuniting at Electromagnetic Field this July. You can stay updated on their plans and activities through their Mastodon account: https://chaos.social/@irishembassy.

For a glimpse into the action, check out our gallery.

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January Repair Cafe

Bring your broken tech and trinkets to get them fixed by the skilled volunteers at TOG Hackerspace – with a bit of help from our friends at Dublin Maker!

On Sunday, 18 January 2026, between 12 pm and 4 pm, TOG Hackerspace will host the first Repair Cafe of the new year in our own space. At this event, volunteers will share their expertise and passion for repair, helping you fix your broken items and breathe new life into them. Whether it’s a malfunctioning gadget, a piece of clothing in need of mending, or a household item that’s seen better days, bring it along and let the team work their magic.

What can you bring in?

  • Clothes and accessories
  • Toys
  • Small electrical appliances and electronics
  • Small furniture

… and many other things!

Safety testing (PAT) for electrical devices will be available.

Continue reading “January Repair Cafe”
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A Holiday Hangout

We will be open for a relaxed holiday hangout over the Christmas and New Year holidays. We’ll be here on Tuesday, 30th December, from 12:00 noon until late.

If you have some time off over the holidays, it’s a great time to drop in to the space. If you’ve never been in before, we’ll give you a tour. Maybe you got some nice gadgets as a present this year…. why not bring them in and show us!

If you’ve any plans for making or hacking in 2026, come in and let us know…. we’d love to hear what’s grabbed your interest and to swap stories.

The kettle will be on all day, with plenty of tea , coffee and biscuits. Bring food if you like.

Drop in for an hour, or stay the whole day! Friends and family welcome.

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Another “Miracle” Repair

CD Mechanism

OK, so not quite as old as that 1970s tape recorder that we fixed last week, but a 1996-vintage Philips AZ8640 Radio-Tape-CD boombox. The CD had stopped working, but the tape and radio were still fine.

Opening up, these things are not meant to be easily disassembled. They tend to be built from the inside out, with not much thought about future disassembly or serviceability.

When we fix old electronics, there are a few “usual suspects”, which quite often give us a fix. Old electrolytic caps are one…. they dry out after a decade or two of service. Another is bad connections or solder joints.

Solder joints, cracked or so-called “dry”, can be hard to see sometimes. Wiggling the component legs can help you see them, or simply re-touching all joints with fresh solder can do the trick. This one was quite spectacular, however.

A 3-legged power transistor that supplies power to the CD mechanism, looks like it had moved on its heat sink, and the 3 solder joints had completely detached from the PCB. Re-soldering the 3 joints brought the CD back to life. The transistor looks like it’s held to the heatsink by a spring clip rather than a screw. Perhaps the spring has failed. It’s very hard to see, and it’s a nightmare to remove the circuit board to check.

Failed Joints

Interestingly, the transistor, a BD236, is still available new from Farnell at €0.72! Here’s hoping for another 30 years of service.

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A Christmas Miracle Repair, Bringing a 1970s Tape Recorder Back to Life

We got a message in the run-up to Christmas with a simple ask. Could we pull off a last-minute repair of a vintage tape recorder and save the day?

When the request came from our long-time friend Claire Downey, the person who first introduced us to Repair Cafés over ten years ago, we knew we had to give it a proper go.

The patient from a charity shop on the bench was an ITT Schaub-Lorenz SL54 Automatic, a Taiwanese-made radio cassette recorder from the mid 1970s, roughly 1974 to 1976. A proper bit of kit, and the kind of thing you do not want to see quietly written off and binned because “sure it’s old”.

Ambrose stepped up to take on the challenge.

If you have ever opened up something like this, the first suspect is nearly always the belts. Those rubber belts drive the moving parts, and after decades they tend to stretch, go shiny, or crumble into sticky bits. You open the case expecting the usual mess, then you cross your fingers that you have a belt in the right size somewhere in the spares box.

This time we got a surprise.

Instead of a belt that had perished with age, we found… a hair bobbin.

Somebody, at some point, had tried to get it going again using whatever they had to hand. Fair play for the creativity, but a hair bobbin is not going to keep the timing and tension right, so the tape speed was off and the audio came out warped.

The good news is we did have the right belt to hand. A straightforward swap, and while we had it open, it turned into a lovely teaching moment. That is a big part of what we do at TOG. It is not only about fixing the thing; it is about sharing repair skills and helping the owner understand what is going on inside their device.

Half an hour later, with the belt fitted and everything buttoned back up, it was time for the real test.

Out came a vintage Beatles mixtape. We hit play. Clean sound through the little speaker. Job done.

Another repair complete, another device saved from landfill, and Christmas officially rescued.

If something breaks over the Christmas stretch, or you unwrap a “project” by accident, do not panic. Bring it along to our next Repair Café on Sunday, 18 January 2026.

https://www.eventbrite.ie/e/repair-cafe-tickets-1977495649721?aff=oddtdtcreator