Magnetic core memory sense amplifier

Schematic / Breadboard

     The 1752 is a 4 channel bipolar magnetic core memory sense amplifier with a sense threshold programmable with a single resistor. When core transitions are detected the signal is latched and may be read from the tristateable output buffers.

     When combined with a 1747(C) core matrix and four 1749 H-Bridge drivers a 64bit memory is realized where each core is individually addressable via an 8 bit data bus.

Note: Although the The connection between the sense comparators and the latching flip-flops is made with a low pass filter to eliminate the high frequency transformer coupling during driver transitions, a 47pF capacitor is recommended at each of the 4 sense channel inputs for improved immunity to the the noisy environment of a breadboard.