1) i dont know which transistor to use........ and also my circuit is single stage (most proboably)
2)i dont know about the frequency of operation.......
3)the output of 3 w must appear across load Rl=1k ohm
4)actually at first my teacher asked me to use 2n176 transistor....which i later discuuses wid seniors and found that this transistor was a old one used in 1950's......its datasheet sucks and its completely obsolete...so i asked mam to give use freedom regarding choice of transistor!!!!
5) Now i also have o simulate on multsim.....or orcad...so that transistor must be included in multisim's database!!!!
Ok if i have to use Vcc as high as 155V , rather i would make my circuit in multistage.......and also what if i reduce my load from 1k ohm to just 100 ohms....would then my Vcc reduce!!!!!!
Let me assume Rc=300 ohm.......transistor efficiency=60%.....Vcc=18 v....... so know i just need to find the values of R1 and R2 of voltage divider circuit , Re(emitter resistor) and the input AC signal to be applied at the base.
chuckey said:"3) the output of 3 w must appear across load Rl=1k ohm", so V^2/1k = 3 therefore V = 3000 ^ .5 = ~ 55. So you need at least 55V RMS = 150 V p-P. So if you have a RC coupled amplifier, the Vcc must be above this figure.!!
**broken link removed**
varunkant2k, I attended a lecture by Linsey Hood in about 1972. It is still with me!!. He demonstrated that a 18 KHZ sinewave sounded different to a 18 KHZ square wave, so the ear must be able to pick up third harmonic of 18 KHZ, 54KHZ !!!! Don't understand why to this day, but it sounded different.
Frank
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