I dont know what the admins are doing, moving half of my post around. seriously?Why do teachers post horrible old circuits like that??
Your circuit is missing a solder joint at the collector of Q1, R13, R14, D1 and D2.
It is also missing very important negative feedback.
It is also missing a very important supply voltage.
The new schematic you posted uses an appropriate low-noise, high-speed opamp and has overall negative feedback. Much more likely to work well.Yes, my math is also bad. Then the total gain is 20 x 2.5 x 40= 2000 times, or +66dB.
Here is a similar power amplifier producing 18W into 8 ohms:
|Thread starter||Similar threads||Forum||Replies||Date|
|R||Audio Amplifier Design HELP||Analog & Mixed-Signal Design||21|
|A||Necessary steps to design Mini Audio Amplifier Circuit With BC547||Analog & Mixed-Signal Design||23|
|V||Help with an audio amplifier circuit design||Homework Help||9|
|Z||Design a BJT audio amplifier||Homework Help||1|
|Audio Amplifier design||Analog & Mixed-Signal Design||15|