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What can I use to amplify this ...

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kevinloh

New Member
My friend has a portable casette and fm player, he only just found out that his earphone was not functioning so he snip off the war phone piece and strip of the cable. Th cable in it contains 2 wires so heconnect it to a 4 inch speaker and sound is heard but the sound was very soft even at full volume, so what can I use to amplify the sound and make it louder?
 

mozikluv

New Member
what amp to use

:D hi there kevinlo, at what wattage are you comtemplating, 1.5w, 5w, 10w or higher. there are lots of amp design in the web using discrete components ir IC amps. check out this website: http://www.discovercircuits.com or http://www.electronics2000.co.uk
I also have a schematic that uses IC as input and 4 transistors as output. this one is very simple and easy to assemble specially if you are new to building amps. I also got this from the web, just forget where just have have to review it. it has 10w output. have tried it and its ok. :D
 

mozikluv

New Member
what amp to use

:D hi there, what power output do you plan to have,do you want a small amp 1.5w to 15w, or a medium power amp 20w to 80w or the in the hundreds. there are lots of amp design in the web just take your pick, of couse sound quality not guaranteed. here a couple of site you can visit, http://www.discovercircuits.com & http://www.electronics2000.co.uk

i have a circuitry for a 10w amp using IC as input and transistors as output. i got it from the web but i forgot where, i will just have to check my files. this one i have tried and i could say it was ok. :D
 

Exo

Active Member
You can make an amp that can give up to 80W in 4ohm or 50W into 8ohm
with the TDA7294. It only needs a few extra components and is very small

(I have made a pcb layout that fits 2 of them (stereo) on a board not bigger then 10 by 4.5 cm)

Datasheet on http://home.eunet.cz/rysanek/pdf/tda7294.pdf
It plays quite well with the setup displayed on page1 of the datasheet.
 

mechie

New Member
Questions...

Are you sure this cassette/fm player is only mono, one earpiece ? not stereo headphones?

What do you want to power this amplifier from ? if the mains is available a deafening 80W amp may be what you want...
If a tiny battery is all you will have then a 100mW (typical pocket radio volume) would be more realistic.
 
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