# DC RC circuit with buffer

#### Darrell75

Joined Apr 19, 2016
16
Hi there- the pictured circuit, taken from Forrest Mims RadioShack electronic lab manual, works as illustrated, but if you take out the capacitor, it does not. I'm trying to get my mind around how this is, but I can't quite see it. Can anyone please illuminate this for me? Thanks!

#### SLK001

Joined Nov 29, 2011
1,548
I would imagine that the capacitor needs to charge to a certain level before the "buzzer" will fire. I'm assuming that the buzzer is a piezo type Sonalert. The cap charges, the Sonalert fires, discharging the cap, then the cycle repeats.