Accessories & Courses
Discrete resistor-transistor XNOR/XOR/NOT logic gate Discrete XNOR/XOR, XOR and NOT gates. The circuitries of the RYO logic gate modules are directly modeled after the very earliest form of digital logic gate designs using resistor-transistor (RTL) pioneered in the 1950s and used in computing equipment throughout the 50s and 60s. The Apollo Guidance Computer for instance used the same type of 3-input NOR gate design now found in the RYO NOR/OR module, although in vastly greater numbers. The RTL circuit design gives the modules some interesting quirks thanks to the transistors thresholds and tolerances when playing around with different amplitudes, waveforms and frequency rates of the incoming signals, making it fun and useful to explore beyond typical logic gating duties, for example as an audio waveshaper/distortion. It can be patched as two NOT gates and one 2-input XOR gate, one NOT gate, one 2-input XOR gate and one 2-input XNOR/XOR gate, two 2-input XNOR/XOR gates or one NOT gate and one 3-input XNOR/XOR gate. Gate one and two has two inputs, the third has one. The XOR out from gate one is being normalled to input 1 on gate two. The XOR out from gate two is being normalled to the single input on gate three (NOT). Listed price is for assembled module. Current draw measured with +5V audio rate signals patched to all inputs, using the same signals gained to +10V the current draw is approximately doubled (ca 28mA).