How many watts will I be able to get out of a LM1875 or LM3875 gainclone when powering it with +/- 12V (300VA)?
I am building a speaker system (dipole midbass, horn midhighs) with high sensitivity drivers (97dB/W/m and higher) and need active filters.. 24dB/oct LR..
The plan is to get tube amplifiers (2A3 SET or alike) to drive the speakers in the future, but for now it would be great to have 4 channels of gainclone power built in to the filter, utilizing the filter's +/- 12V PSU... I will not need more than 2W from each clone.. Will the chips be able to deliver this at +/- 12V?
Also, how will the chips heat at such a moderate power? Will I need heatsinks, or can I just bolt them to the alu chassie?
I am building a speaker system (dipole midbass, horn midhighs) with high sensitivity drivers (97dB/W/m and higher) and need active filters.. 24dB/oct LR..
The plan is to get tube amplifiers (2A3 SET or alike) to drive the speakers in the future, but for now it would be great to have 4 channels of gainclone power built in to the filter, utilizing the filter's +/- 12V PSU... I will not need more than 2W from each clone.. Will the chips be able to deliver this at +/- 12V?
Also, how will the chips heat at such a moderate power? Will I need heatsinks, or can I just bolt them to the alu chassie?
http://www.national.com/appinfo/audio/files/Overture_Design_Guide13.xls
http://www.national.com/appinfo/audio/files/Using_Overture_Design_Guide.pdf
Check this file!
You need 2 watts and you plan to use 300 VA transformer?
May I ask what kind of speakers you have and also how high volume you want?
With a "normal" speaker you will get 90-96 dB at 1 m, meaning 80-90 dB in the room. This is not much I would say.
I suggest that you get a 2 x 24-28 VAC/150-300 VA transformer.
According to spreadsheet you will get 5-6 W and with so low power supply voltage you can mount the IC's directly into chassis.
http://www.national.com/appinfo/audio/files/Using_Overture_Design_Guide.pdf
Check this file!
You need 2 watts and you plan to use 300 VA transformer?
May I ask what kind of speakers you have and also how high volume you want?
With a "normal" speaker you will get 90-96 dB at 1 m, meaning 80-90 dB in the room. This is not much I would say.
I suggest that you get a 2 x 24-28 VAC/150-300 VA transformer.
According to spreadsheet you will get 5-6 W and with so low power supply voltage you can mount the IC's directly into chassis.
That is correct.peranders said:
peranders said:
The Supravox 215 GMF midwoofer is rated 97dB/W/m, the TAD 4001 on the horn is rated around 111dB/W/m but I suspect it's actually louder mounted on my round tractrix horn. Both is 8 ohms steady load.
peranders said:
Out of the question. I'm reluctant even to spend on chips and caps/resistors for the chipamp. My funds goes into tube projects and speakers at the moment, so the chips will have to use my +/- 12V that is already in use in the active filter, or there will be no chips. This is only ment to be a short term solution while awaiting funds for completing my SET tube projects.
peranders said:
Thanks. Thoose watts will keep me running for a long time.
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