4 ms·
>I've definitely taken a pre-EE class where we breadboarded a bunch of logic circuits without decoupling caps Same! I didn't realize you needed them until I en
by cushychicken 7y ago
>I've definitely taken a pre-EE class where we breadboarded a bunch of logic circuits without decoupling caps
Same! I didn't realize you needed them until I entered industry. I think that's a little disappointing - it's a very simple explanation, just one that most professors don't choose to spend time on.
I'm trying to put together a good demonstration of why you need decoupling capacitors in a lab setting. Best one I can think of is paralleling a bunch of inverters with no decoupling caps, and then measuring the current draw on the rail using a shunt resistor.
- kragen 7y agoBreadboard parasitics don't help. Or, rather, they do.
- cushychicken 7y agoThey help, until they don't. Or they don't until they do! XD
- kragen 7y agoMaybe you should involve an ADC or DAC in your demo. Shitty audio is a more convincing problem than a VCC current measurement, and even tens of mV of ground bounce should be quite audible.