Circuit Diagram
How to Build It
- Place the LM358 op-amp on the breadboard, powered between the positive and negative rails.
- Connect a feedback resistor from the output (pin 1) back to the non-inverting input (pin 3) — this creates the hysteresis.
- Connect a capacitor and resistor in series from the output to the inverting input (pin 2) — this forms the RC oscillator.
- Connect an LED with a limiting resistor to the output, to visualize the switching.
- Power the circuit — the LED should blink at a steady rate, with sharp (not gradual) transitions.
Bill of Materials
| Product | Code | Qty |
|---|---|---|
| Integrated circuit | #N/A | 1 |
| Capacitor (electrolytic/ceramic/SMD/film) | — | 1 |
| LED (3/5/10mm, SMD, power) | l-934ID-12V | 1 |
| Resistor | DR47K-8/9 | 2 |
| Resistor | DR100R-418 | 1 |