| General > General Technical Chat |
| What was your first circuit? Do you still remember it? |
| << < (14/21) > >> |
| jonpaul:
Screwdriver magnetizer with yoke coil and 6X4 tube, 1955 Filament transformer and bridge rectifier/cap to make 12VDC to run model T spark coil to drive tesla coil. 1957 Transistor tester 1960 j |
| unknownparticle:
For me it was a guitar fuzz pedal for a lad in my class at school. He was in a band playing lead guitar and fancied himself as the next Jimmy Page!! The project was out of Everyday Electronics mag. Problem was I couldn't test it before he tried it, as I don't have a guitar or amp. Gave it to him on a Friday afternoon and he gave it back to me on the Monday and said it doesn't do anything! So I checked all my work, it was on veroboard, so I was suspecting a wrong connection somewhere but I couldn't find any mistakes. So I looked at the circuit and layout in the mag for ages, and eventually found a layout error!! I was gobsmacked at the time, I was really shocked that a/ the mag made a mistake, and b/ I found it! So, I corrected that and arranged to take it over to his place for a test run! It was quite intimidating for a schoolboy to turn up to a band practice with these edgy dudes with attitude! So we connected it up and he played a few chords with me trying the controls and it worked really well, he was well pleased as were all the other guys! He wanted it modifying though, with a foot switch to turn the fuzz on and off, that was a bit tricky but I managed it and all was good! My cool rating went to 10 at school after that! |
| ccktek:
My memory of my first circuit is one of my most formative. When I was 6 my father brought home from the hardware store a large carpentry nail, a length of bell wire, several small steel brads, and a No. 6 dry cell. We wound the wire on the nail and connected the ends of the wire to the cell, magnetizing the nail, which attracted the brads. To me this action at a distance was (and still is) miraculous. I’d witnessed a consequence of Ampere’s law. Maxwell would come much later. |
| brucehoult:
--- Quote from: ccktek on November 07, 2022, 11:25:15 pm ---My memory of my first circuit is one of my most formative. When I was 6 my father brought home from the hardware store a large carpentry nail, a length of bell wire, several small steel brads, and a No. 6 dry cell. We wound the wire on the nail and connected the ends of the wire to the cell, magnetizing the nail, which attracted the brads. To me this action at a distance was (and still is) miraculous. I’d witnessed a consequence of Ampere’s law. Maxwell would come much later. --- End quote --- Similar except we used part of an old hacksaw blade, fixed at one end, and arranged so the current for the solenoid went through the hacksaw blade, until movement towards the solenoid broke the circuit. |
| eti:
--- Quote from: Sredni on November 06, 2022, 06:00:31 pm ---I remember: a wired telegraph. Two pieces of wood with a small lightbulb and a switch made with a flexible sheet of metal that controlled the other terminal's bulb. Very high tech. For some reason, neither my parents nor my cousin's seemed to think that drilling a hole in the floor/ceiling to let the wire through was a good idea. Adults. Go figure. --- End quote --- A horse-powered drill? Wow. Did you get Swan or Edison to invest? When you mentioned telegraph, I pictured you in a top hat and tails, working by lamplight 😁 |
| Navigation |
| Message Index |
| Next page |
| Previous page |