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Electronic construction kits
In message , Martin Brown
writes On 10/11/2020 03:22, wrote: On Monday, 9 November 2020 18:31:29 UTC, charles wrote: In article , Adrian wrote: In message , Martin Brown writes That was the newer version after the one I described with the manually assembled spring loaded clips and raw components. I suspect the base board was the same on both kits. That sort of industrial hole board that tools get hung up on. OK the transistors had longer flexible leads them and some araldite reinforcement around the body. You had transistors ? I had (and still have) the Mullard book "Transistors for the Experimenter" which was published in 1956! So yes, we had transistors in the 1950s. way too expensive for kids' kits back then. In the 50's yes, but by the mid to late 1960's there were even better transistors about so that the OC7x, AC127 and AF116 were affordable. ISTR blowing one up was still an expensive mistake for a schoolkid. Memory lane.. For reasons best known to my employer, having shown no specific aptitude and studying electrical engineering at college, I was moved to the electronics dept. for my final 2 years as an apprentice. I think the *whizz kids* who actually knew something had moved elsewhere. The dept. had previously used Mullard Norbit gear but was moving to an in house logic system using the Texas Instruments germanium switching transistor 2G302. Based on a *plug in* system using an 8 pin valve base and with timers, delays, pulse units etc. it provided an easily repairable/adaptable system. I got sent all over England and Wales doing the on site commissioning. TI discontinued production on the 2G302 and we changed to an equivalent NKT218 from Newmarket Transistors. Also quickly discontinued so we had to change the supply polarity and use silicon NPN. -- Tim Lamb |
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