Building a preamp

82Blues · 15th December 2008

Hey guys I'm building a preamp right now and I have a question. It currently has one balanced output on a TRS connector that will eventually be the insert send. What will happen if I plug headphones into this connector?

Doc Mixwell · 15th December 2008

It will buzz???????

Try it and report back, or leave that output for its intended use [better idea]

Headphones want to see Speaker Level signal, not +4 Line Voltage.

flamango · 15th December 2008

Actually, line level voltage is pretty close to what headphones want. If you plug headphones into a power amp, you'd probably fry them.

Here's a thread on the lab about this:

Headphone level to line level? Dumb question

(also, that is generally a good place to post questions about DIY gear.)

First Aid · 16th December 2008

how come you can build a pre-amp, rewire the o/p as an insert and don't know this?

15th December 2008	#1
82Blues Gear interested Joined: Nov 2008 Posts: 29 Thread Starter	Building a preamp Hey guys I'm building a preamp right now and I have a question. It currently has one balanced output on a TRS connector that will eventually be the insert send. What will happen if I plug headphones into this connector?

15th December 2008	#2
Doc Mixwell 70% coffee & 30% beer Joined: Dec 2006 Location: Quincy, MA Posts: 7,728	It will buzz??????? Try it and report back, or leave that output for its intended use [better idea] Headphones want to see Speaker Level signal, not +4 Line Voltage. __________________ Adam Brass adam@dspdoctor.com DSPdoctor "Pro Audio Gear And Advice for the Modern Recording Studio" ________________ "Any opinions above are worth exactly what you paid for them." Anonymous "If I find 10,000 ways something won't work, I haven't failed. I am not discouraged, because every wrong attempt discarded is another step forward. Thomas Edison RTFM

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15th December 2008	#3
flamango Gear interested Joined: Dec 2008 Posts: 1	Actually, line level voltage is pretty close to what headphones want. If you plug headphones into a power amp, you'd probably fry them. Here's a thread on the lab about this: Headphone level to line level? Dumb question (also, that is generally a good place to post questions about DIY gear.)

16th December 2008	#4
First Aid Gear maniac Joined: Nov 2008 Posts: 238	how come you can build a pre-amp, rewire the o/p as an insert and don't know this?