Meta Portal Given New Life As Extended Display

The Meta Portal and associated devices are effectively defunct, having been abandoned by the company in 2022. If you’ve still got one at home, you might be wondering what to do with it. That’s where Wormhole Display from [pgodlews] comes in handy.

The thing about the Meta Portal, and much of the rest of the related lineup, is that they were effectively just heavily branded Android tablets. The screens and speakers were good, and the basic functionality was all there — albeit locked down somewhat to prevent users from easily repurposing them at will. However, it’s possible to enable Android Debug Bridge (ADB) and turn the device to doing your own bidding.

To that end, [pgodlews] built Wormhole Display as an APK that can be dropped on to the Meta Portal to make it an extendable display for Apple devices. It shows up via AirPlay, letting you use it as a wireless display for your Mac, iPhone, or iPad. You can do screen mirroring or use it as an extended display, as desired, including use of the Portal’s speakers if needed. Under the hood, it’s an Android port of UxPlay, a Unix AirPlay server which uses Android’s MediaCodec and AudioTrack in place of GStreamer to take advantage of the Meta Portal’s onboard H.264 decoder.

Extended displays can be incredibly useful, so if you’ve got an old Meta Portal laying around, consider putting it back to work. We’ve seen it done with e-readers, too. If you’ve got your own hacks to repurpose old, forgotten hardware, don’t hesitate to let us know on the tipsline!

TV Audio Tube Makes A Transceiver

It’s not often we see a tube project here, so [Helge Fykse]’s PCL86 transceiver is a welcome find.

If you know anything about the European Pro-Electron device naming system you’ll be familiar with it as it applies to tubes. The first letter denotes the heater specification, for example “E” is for a 6.3 volt heater. Everyone wants the familiar 6.3 V devices, but they have a set of cousins which often pass unnoticed. “P” tubes have a 300 mA heater designed such that all tubes in a device could be connected in series at the same current. Of those tubes the PCL86 is a mundane example, filling the function taken in the semiconductor years by the LM386. It’s a small-signal triode and a power pentode in one device, and it’s an audio amplifier. Every 1960s TV set in Europe had one, and thus it’s a good choice for experimentation.

This transceiver is a conventional crystal oscillator and power amplifier on transmit, but with a flick of a switch it transforms into a direct conversion receiver in which the triode becomes oscillator and mixer while the pentode becomes an audio amplifier. It’s simple, and the video below the break explains it in great detail. We’re not sure whether or not it could unintentionally radiate in receive mode, but we’re guessing the energy would be tiny.

A simple tube project can make an interesting departure from modern surface mount electronics, so if you get the chance we’d suggest you try one. If you don’t need a transceiver, an audio amplifier is the archetypal PCL86 project.

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