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  1. J

    Advice on soldering raster boards

    Hi, a few days ago I soldered my very first electronic circuit on a raster board (grid of individual holes). The end result worked fine but it doesn't look very nice. The lead blobs are sometimes too big and clumsy. I would like some advice on how to solder on a raster board where every...
  2. J

    How to find out LED characteristics?

    I recently got a few blue leds from a friend. When I connect them to 5V with a 600 Ohm resistor they shine brightly (i.e. they even blind when looking straight at them). However, normally when the led would support 20mA I should be able to use even lower resistors. However I don't want to damage...
  3. J

    Looking for info about TDB0555 ICs

    In a collection of old parts I found TDB0555 and a TDB0556 chips. I wonder if they are equivalent to the NE555 and NE556? I wasn't able to find any information about the TDB versions. Greetings and thanks,

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