Sagan builds a rain detector circuit with Dave’s original Science Fair Tandy / Radio Shack 200-in-1 electronics projects kit from the 1980’s, and testing it using Dave’s first multimeter! Forum HERE Watch Sagan soldering for the first time!

Dave got a tip-off on a dumpster full of instruments, so raced off to check it out, what will he find? Forum HERE

Mailbag Monday, teardown bonanza! Forum HERE SPOILERS: – West German Geiger Counter Teardown – 6:35 Leo Bodnar Oscilloscope 40ps Pulse Generator for oscilloscope bandwidth measurement. – 11:32 Pocket Sprite Keyring Gameboy Teardown – 14:31 Defibrillator Simulator Teardown – 21:23 – Philips CD Discman Teardown

Taking a look at a sub 3 cent microcontroller, and other obscure Chinese manufactures, how to find them, and were to get them in stock. http://www.padauk.com.tw https://lcsc.com Forum HERE

More Mailbag Monday Forum HERE SPOILERS: A-TEK AT-601 PC ISA Bus Design Breadboarding Tool Gigatron TTL computer update Home VintageTek museum XY demo board https://www.ebay.com/str/vintagetek 1970’s Casio CQ-1 Calculator Zofz PCB Gerber Viewer https://www.zofzpcb.com/

How to turn a horrible unorganised schematic into a nice readable modular schematic with proper signal flow. Tips on industry standard and expected layout techniques. Using the open source Haasoscope oscilloscope as an example. Please do NOT complain about the length of this video. I know. It is what it is. 9:28 LED configuration 12:28 ...

Follow-up to the Studio Monitor Noise video, replacing the mains power supply with a battery supply. Does the noise floor go away? Forum HERE

Yes, Mailbag Monday is back! Weekly mailbag videos to come. Perhaps the worst schematic ever seen? SPOILERS: Only two items for today’s Mailbag, and I had a lot to say on each. The WIHA SpeedE Electric Screwdriver 16:10 Will the HaasoScope 4CH 60MHz 200MS/s change Dave’s mind on USB oscilloscopes: https://www.crowdsupply.com/andy-haas/haasoscope https://github.com/drandyhaas/Haasoscope/ Forum HERE

What’s is this obscure 1970’s bit of kit from a big name manufacturer? AliExpress Affiliate Forum HERE

This sub US$500 Eakins microscope from Aliexpress seems identical to the new AU$1800 Suba Engineering microscope for 1/3 the cost. And Dave shows how it can out perform the $4500 Tagarno! http://s.click.aliexpress.com/e/b7ycSav2 http://s.click.aliexpress.com/e/eN3Ec5a http://s.click.aliexpress.com/e/bHSXalzm http://s.click.aliexpress.com/e/cMimkzYc Forum HERE