What is the cheapest receiver you can make for VHF? Here is a candidate where all you need to do to modify a small FM headphone receiver is to desolder one end of two capacitors, and connect a short cable with an antenna connector.
This Saturday morning, our friends Maddie Moate and Greg Foot will be live at The Centre for Computing History for a computing- and retro gaming-inspired episode of their show Let’s Go Live, and you can tune in from 10am to join the fun.
Retro gaming and computer funtimes
Saturday’s show will be a retro feast of vintage video games, and will answer questions such as ‘What is a computer?’ and ‘How do computers work?’. As always, Maddie and Greg have a number of activities planned, including designing pixel art and going on a tech safari! They’re also extremely excited to step inside a giant computer and try to put it back together!
Let’s Go Live
Let’s Go Live is a family science show that Maddie and Greg began on day 1 of lockdown to help with the challenge of homeschooling. Since then, Maddie and Greg have hosted 50 live shows from their ‘spare room studio’ and caught the attention of millions of families across the world who enjoy tuning into their daily dose of fun, facts, and science activities.
After a short break, the two are now back for the summer holidays and plan to make Let’s Go Live bigger and better than ever by bringing you live shows from unique locations across the UK — a new venue each week!
We don’t blame you! If you’ve already been following Maddie and Greg on their Let’s Go Live journey throughout lockdown, and you’re looking for more fun online content to entertain you and your family, look no further than the Raspberry Pi Foundation’s Digital Making at Home:
Digital Making at Home
Each week, we share a themed code-along video and host a live stream to inspire families to have fun with coding and digital making at home! Join Christina, Marc, Mr C and their host of special guests as they work their way through our great coding activities. This week, the Digital Making at Home team has been exploring outer space, and they show you how to use Scratch and Python code to race the International Space Station, animate astronauts, and defy gravity.
And our next theme for Digital Making at Home — out tomorrow just when Let’s Go Live finishes — is retro games!
You’ll find all the episodes of Digital Making at Home on our website — new ones are added every Saturday morning. And on the website, you can also tune into our weekly code-along live stream every Wednesday at 2pm BST!
So, two little switching power supplies, one for the DOB-50 and CTC-5 as they have similar operating voltages, and one higher voltage one for the DOB-80, a simple op-amp comparator to output the pulses to an Arduino to process and display the results. The power supplies are controlled using two MC3406AD’s, driving an IRF840. I’ll just refer to the component numbers on the top supply, the bottom one is almost identical. The back EMF from the inductor L2 is rectified by a UF4007. There’s a feed back loop, R14,15 & 16 and the pot is used to adjust the HT..
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