Diode and capacitor in voltage protection circuit
Hi Folks,
In the image below, I believe the diode and capacitor are there to protect the circuit from too high a voltage coming from the DC power source (correct?). My question is what is the exact purpose of the diode and the capacitor are, and why were they specifically chosen?
http://imgur.com/j1hm9
Many Thanks,
ff
In the image below, I believe the diode and capacitor are there to protect the circuit from too high a voltage coming from the DC power source (correct?). My question is what is the exact purpose of the diode and the capacitor are, and why were they specifically chosen?
http://imgur.com/j1hm9
Many Thanks,
ff
- CHEEZOR
- Diode Debunker
Please wait for someone else who is more knowledgeable to reply, but I believe they are for reverse polarity protection which is meant to save your circuit in the event that someone hooks up the pedal with the polarity opposite what it should be.
- Duckman
- Opamp Operator
Cheezor is right: only a reverse polarity protection, but just the diode.
The cap is for power source filtering... but 22uf? It looks a little "short" since any chinese wall wart can have a 1000uf inside
The cap is for power source filtering... but 22uf? It looks a little "short" since any chinese wall wart can have a 1000uf inside
- CHEEZOR
- Diode Debunker
Oh yeah. I totally spaced that. Thanks!Duckman wrote:Cheezor is right: only a reverse polarity protection, but just the diode.
The cap is for power source filtering... but 22uf? It looks a little "short" since any chinese wall wart can have a 1000uf inside
- FiveseveN
- Cap Cooler
Information
http://en.wikipedia.org/wiki/Decoupling_capacitor
There's a duplicate thread on the other forum and another tangent discussion that provides more concise answers.
There's a duplicate thread on the other forum and another tangent discussion that provides more concise answers.
Ignorance more frequently begets confidence than does knowledge. (Charles Darwin)
- IvIark
- Tube Twister
Information
I think this is semantics of our favoured terminology. Decoupling, power filtering, ripple reducing, the cap can be performing all of the above.
The real mystery is why builders keep using parallel protection diodes without a fuse so that under reverse polarity the diode can take a chunk out of your board.
The real mystery is why builders keep using parallel protection diodes without a fuse so that under reverse polarity the diode can take a chunk out of your board.
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- Duckman
- Opamp Operator
Tanks. First line of the mentioned article:FiveseveN wrote:http://en.wikipedia.org/wiki/Decoupling_capacitor
There's a duplicate thread on the other forum and another tangent discussion that provides more concise answers.
This article is about the use of capacitors to filter undesired noise from power supplies.
- earthtonesaudio
- Transistor Tuner
No mystery here. Boss did it that way because their 1A diode would get hot (but not burn) when hooked up backward to their 1A PSU. No fuse necessary. Boutiques and diyers copied Boss because... Er, tradition, I guess.IvIark wrote:I think this is semantics of our favoured terminology. Decoupling, power filtering, ripple reducing, the cap can be performing all of the above.
The real mystery is why builders keep using parallel protection diodes without a fuse so that under reverse polarity the diode can take a chunk out of your board.
rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.