headphone amp not pimeta not cmoy

[Fuzzy Fuzzbucket 0]

is there any way to reduce the power output of a 2000mW to a safer output for headphones??

Edited August 21, 2007 by Fuzzy Fuzzbucket

[Fuzzy Fuzzbucket 0]

ok i manage to find a 0.25watts amp... see how it goes...

[Fuzzy Fuzzbucket 0]

here's a later update... finished in 3hrs...

it uses 2 AA sized batt...

-power supply : 3-12VDC (for 0.25 watts 8ohms per channel)

- consumption : 500mA max. @ 9VDC. (using a loudspeaker 8Ω 1Wx2)

- output power : 1+1W max. stereo

- S/N ratio : 70dB (A weighted)

- sensitivity (1kHz/500mW) : 120mVeff

i preset the amplification level so the the amp just amplifies that much. the rest is controlled by my player...

Edited July 19, 2007 by Fuzzy Fuzzbucket

[chrono 0]

Wow! Nice work! The case looks really small...

What are the dimensions?

[Fuzzy Fuzzbucket 0]

Wow! Nice work! The case looks really small...

What are the dimensions?

hmm... 115 X 65 X 20 mm...

[Fuzzy Fuzzbucket 0]

i made a smaller one today

[attachmentid=3888]

[attachmentid=3889]

[attachmentid=3890]

fit into a card case i got from Daiso..

this time instead of AA batteries, i use AAA

[Fuzzy Fuzzbucket 0]

FK676 is out... a headphone amp... similar to FK673 it uses TDA2822

i scanned out the schematics as it cannot be found on the manufacturer's page...

[attachmentid=3894]

FK676 is the one above with 673 below it...

sorry about the poor scan...

the PCB size is slightly smaller than FK673 and in terms of sound, this is abit more detailed really dependant on the TDA2822... i didnt use electrolytics for C1 and C5 in 676...

[attachmentid=3895]

[Fuzzy Fuzzbucket 0]

found out a few people already have the TDA2822 opamp amps already... here's the spec sheet for TDA2822 http://www.st.com/stonline/books/pdf/docs/1464.pdf