Raspberry Pi 5 desktop for $85 from used and new parts

Watch video: https://youtu.be/Y-xlOSC9IE

https://sites.google.com/site/pcusbprojects

I've made a ventilator cooled casing for my Raspberry Pi 3 three years ago. But on the 28th of September I ordered a brand new bare Raspberry Pi 5 as I had strongly believed that I would have been able to make a case with a cooler for it myself. My Raspberry Pi 5 finally arrived after two months of waiting. Though Raspberry Pi 5 was a perfect match for the old Raspberry Pi 3 case it needed a much more capable cooling. However, an already large ventilator that was strapped to the case only needed a more direct air flow path to sufficiently cool Raspberry Pi 5's BCM2712 system on chip and D A 9091 power management chip. Drilling a large hole into a plastic case cover plate is precarious, because you may easily break it in two. I therefore proceeded with a great caution. I used a hand drill to make to make a circle of small holes and I afterwards added intermediate holes to further weaken the plastics to make it possible to cut out a large circular hole for incoming air from the ventilator. A large slowly turning ventilator makes little to no noise, but it still sufficiently cools my Raspberry Pi 5 at a maximum C P U load. Later, I've also learned that I was lucky to pick a 12-volt ventilator that could run at 5 volts. Such ventilators are usually found in old PC power A T X power supplies with automatic ventilator speed regulation. If directly connected to the Raspberry Pi 5's five-volt rail, the ventilator turns constantly regardless the internal power state. A small 2-amper M O S F E T transistor circuit is needed to switch the ventilator on and off as Raspberry Pi 5 is booted or shut down. I've used 40-pin expansion 3.3-volts pin to drive the ventilator. The pin is always powered when then computer is running. The circuit includes: a 15-amper M O S F E T, B C 109 bipolar driver transistor and a 10-kilo ohm, a 4.7-kilo ohm and a 100-ohm resistor. If more cooling is needed, an external 12-volt power source may be used to power the ventilator instead of 5-volts from the 40-pin expansion connector. This would spin the ventilator at maximum speed and provide much more cooling for the hot summer months. What about analog audio? You may need a USB sound card, if you use an old radio with a CD player or old computer speakers to play sound. I had first thought to make a sound card myself, but it was simply cheaper to buy one for around 5 US dollars from an internet computer store. A power supply and a micro HDMI to HDMI cable were needed to complete my desktop Raspberry Pi 5. I already had a 5-volt 4-amper power supply, which was sufficient to run Raspberry Pi 5 with a bit lesser load on its USB ports that was permitted by USB 2.0 and USB 3.0 standards. Fortunately, I had no intention to connect a USB powered hard disk or solid state drive. A new Raspberry Pi 5 original power supply costs So far I've paid 80 US dollars for Raspberry Pi 5 and 5 US dollars for the sound card, which makes for the total cost to 85 US dollars for a Spartan Raspberry Pi 5 without an enhanced power on management controller. Watch Raspberry Pi 5 Wi-Fi Lock and Power On Manager video to see how you can make it. AI Thinker E S P 32 camera board will cost you about additional 10 US dollars. I already had one from my older projects, so it's been at no additional cost to me. My Raspberry Pi 5 Desktop works perfectly and it is real fun to look at the power on L E D through ventilator blades! The spinning ventilator blades make the new computer look magical.

Watch video: https://youtu.be/Y-xlOSC9IE