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    NEED HELP making 4-bit adder/subtractor in Logisim

    https://www.geeksforgeeks.org/digital-logic/adders-and-subtractors-in-digital-logic/ Build a custom IC in your sim package using NAND gates. Sorry for the late reply, as my time machine is on the fritz again.
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    need help for making a tiny transmitter and its tiny receiver

    Think about a simple radio controlled car at 49Mhz. The car would go forward always when on and had a simple receiver listening at 49.125 MHz The transmitter was a simple crystal oscillator using the 49.125 frequency. The receiver had one job. Engage a DPDT relay that reversed the motor to back...
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    Help with vintage transistor replacement

    Thank you for providing the schematic, it helped a bunch. The Transistor was built on the 46th period of 1972. Really any low beta PNP transistor in a TO-3 case will work due to the transformer coupling and the amazing amount of dc bias in the voltage divider circuit of the transformer...
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    Replacement transistor help needed

    The part number in my opinion has the replied data correct as 75v 86 amp. What is the case type? Id be happy to send you an IXYS part number you can use as a good replacement from mouser or Digi key. Next find the FET driver, if it has one or the previous transistors driving parts and let me...
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