Recommended for boring board meetings. Parts not at correct values.
Variable control is volume control on transistor radio. The wiper is radio signal input shown as low voltage AC source.
The capacitor represents minature dynamic mike. Microphone input goes through diode decector to coil of last I.F. transformer.
Turn ON radio and tune in station. Speech is amplified as well as radio station. Tune to no station to use as hearing aid only.
