Quote from: J M Fahey on July 23, 2010, 07:15:48 AM
Hi.
As I see it, jordi is set to build *an amplifier*.
Obviously as a personal project, to learn new skills, to spend a few afternoons doing something he likes, the works.
The fact that it's a Frontman, or anything else, is not that important.
In fact, when somebody who's getting into homebuilding asks me what to do, and wants to start designing from scratch, I usually suggest him to keep it simple , building a straight "Datasheet application" power amp and a simple but good preamp such as Rod Elliot's.
If he wants to go further, I suggest him to copy some relatively simple yet good sounding *commercial* amp.
Hey!!, that Frontman fits the bill !!
Besides, powering that 3886 as the datasheet suggests (+/-28V into 4 ohms or +/- 35V into 8 ohms) will give him a 50 or 60W RMS power amp, which driving a good speaker (Jensen Mod1270) will be a *loud* and quite professional amplifier, well above the original Frontman "25".
Besides, having recently won the FIFA World Cup, the Spaniards are now spirited to conquer the World. :tu: :tu:
Cuídennos la Copa, la tienen en préstamo ,la próxima nos la llevamos nosotros a casa :lmao:
I can't say that better!
When you talk about output power depending on Vcc, do you say that according to graphic 01183349 Output Power vs Supply Voltage? I think I would feed it with the 27Vdc that TDA1514 has. If you were talking about that graphic it would take about 40W, enough for what I need. I was thinking about changing External-Internal speaker connection so, when a speaker is connected to the External output, the internal speaker keeps sounding driving it parallel, if they are both 8ohm there wouldn't be a problem, is it correct? 'Cause I would like to test combining different speakers with the same output.
Two questions, does anyone know the J4 headphone connector's name? I can't find it anywhere? and some help with transformer secondary current?
Quote from: teemuk on July 23, 2010, 07:47:25 AM
One thing I would do is to build the power amp entirely on a different board than the preamp. If either one proves to be dissapointing in time you can easily throw in something different in there.
I appreciate the advice, but I think I will buy it in the same board, I think there will not be any problem with that. In fact, there's no significative changes. The only thing I kept from LM3886 datasheet (which is more hi-fi oriented) is the mute part, which doesn't affect on the sound if it's not open circuit. Otherwise, keeping all in the same board will make much clear for me and simple when mounting on the chassis or cab.
By the way, you better get used to Spain winning the FIFA World Cup. :lmao: