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  1. inferno

    Frequency Counter

    ei! help me with circuit.. i want to change the semiconductors...will you please suggest a substitute for this.. tnx!! Resistors (all 1/4W 5% carbon film) R1,R9      1k (brown, black, red, gold) R2,R10,R11   470R (yellow, purple, brown, gold) R3,R13      10k (brown, black, orange, gold)...
  2. inferno

    0-20 (3A) and 0-40 (1.5)A Power Supply (Elenco)

    Hello!!! Here is a schematic that I want to modify... I want the 0-20 (3A) to become 5A 0-40 (1.5A) to become 2.5A Any suggestions?.... tnx!!! xp-750.pdf
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