This voice transmitter is a short range transmitter which has a 15
meters range without an antenna,and this can be increased several times
over if an antenna is used.The circuit can accept inputs from music
systems,high impedance microphones and any amplifier.
A single AC188 pnp transistor handles modulation.RF amplification and transmission.The 3 volt transformer used to boost the input level and provide higher impedance when a low impedance source is used.The circuit works off a 6 volt battery.
VCR and the position of the MW antenna coil(used in pocket receivers) must be adjusted to obtain the best output from the unit on a receiver tuned to a dead spot on the MW band,placed a few meters away.Batteries should be used in preference to adapters and these would give a considerably long life as the consumption is quite low.
A single AC188 pnp transistor handles modulation.RF amplification and transmission.The 3 volt transformer used to boost the input level and provide higher impedance when a low impedance source is used.The circuit works off a 6 volt battery.
VCR and the position of the MW antenna coil(used in pocket receivers) must be adjusted to obtain the best output from the unit on a receiver tuned to a dead spot on the MW band,placed a few meters away.Batteries should be used in preference to adapters and these would give a considerably long life as the consumption is quite low.
The Schematic Voice Broadcaster
