See the next euroelectron posts.
The amplifier is just a 2N3053 bipolar transistor operating in class A.
The speaker is the Philips AD5046N, 800Ω.
Current consumption is only 6mA with the current bias resistor used from collector to base.
As of writing this the song Little Star - Madonna plays on CD.
The sound quality is excellent.
Excellent bass, middle and treble frequency information.
And this Philips speaker may possibly be the best ever used on Pleiades experiments.
Voltage drop at the battery terminals is minimal about 200mV.
Some distortion becomes now obvious as the 9.6V NiMh rechargeable battery has discharged from 10.4V to 8.5V.
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