Fully analog implementation of adaptive spiking level-tuned synapse with adjustable parameters. Intended for researchers, students and teachers.
The circuit performs three synaptic functions in parallel:
Learning rates, max-min spike frequency and pulse length can all be controlled by the potentiometers and variable capacitors. An LED is included for visualization of the spike train.
A header is provided for input, output, post-synaptic feedback and weight monitoring.
With some minor modifications to the circuit design, to reduce power consumption, the 2 capacitors can be replaced by memristors (now available to the public on knowm.org).
|Circuits.io Bill Of Materials|
|UINV||1||Hex Inverter [74HC04] Hex inverter||SOIC14|
|U1||1||SINGLE SCHMITT-TRIGGER BUFFER This single Schmitt-trigger buffer is designed for 1.65-V to 5.5-V VCC operation. The SN74LVC1G17-Q1 contains one buffer and performs the Boolean function Y = A. The device functions as an independent buffer, but because of Schmitt action, it may have different input threshold levels for positive-going (VT+) and negative-going (VT–) signals.||5-Lead SOT-23|
|T1, T2, T3, T4, T5, T6, T7, T9||8||transistor (nmos) IRLML6344TRPBF||SOT23-3|
|T8||1||NPN Transistor (BJT) A bipolar junction used for amplifying or switching electronic signals. This type of BJT (Bipolar Junction) needs a positive current in the base terminal.||SOT23-BEC|
|Rpot1, Rpot2, Rpot3, Rpot4||4||Potentiometer A variable resistor. When the external sides of the potentiometer are connected to voltage and ground, the middle leg will give the difference in voltage as you turn the knob. Also know as pot.||TRIM_POT_PTH||250 kOhm, 0 hidden|
|UAND||1||Quad AND gate [74HC08] Quad 2-input AND gate||SOIC14|
|R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13||13||Resistor Resist the flow of electrical energy in a circuit, changing the voltage and current as a result.||0309/10|
|1, 2||2||Variable Capacitor||Variable Capacitor|
|J1||1||1x4 Pin Headers 1x4 Common Pin Header||1x4 Pin Header|
|U2||1||Power/Ground connector 2 pin 2.54 spaced header for power and ground||header(1x2)|