jgorman01 wrote: > Just a quick example. In order to achieve a flat passband of 3 kHz > you may really need an amplifier whose bandwidth is 10 or even 20 > kHz. To achieve this, you probably can't use just one single stage of > audio amplification with a simple emitter bypass electrolytic > capacitor, you'll need several stages of Class A (both DC and AC bias > stabilized) thereby raising the costs significantly. Precision > components will be used rather than run of the mill 10% tolerance. It > all adds up both in cost and performance. > > Jim WA0LYK
I am afraid we are aiming at different solutions. I wouldn't use bipolars, I would use op amps. Well used, you would incur in less than 0.1 % distortion, and I am afraid it is much more than what it would deliver. I have achieved in practice distortions in the order of 0.05% or less for pro audio designs. With op amps, you just decide the corner frequencies, and the gain you want. Of course, you must consider the open loop gain and the unity gain frequency. The rest is choosing the right resistor values. The rest of the engineering needed is already included inside the chip. And unless you are working with balanced, matched amplifiers, a fraction of a dB goes nowhere. So, 10% resistors are perfectly adequate. I would avoid aluminum foil electrolytics. Those are the quickest aging and most prone to fail components in a properly done design. 73 de Jose, CO2JA __________________________________________ XIII Convención Científica de Ingeniería y Arquitectura 28/noviembre al 1/diciembre de 2006 Cujae, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/convencion Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
