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I.C.s are LM 386s Input (small 8ohm Batteries are 9V
8 pin dip 1/2 Watt amp. speaker works ok) 'Transistor radio' type.
10K^ /? 10K^
??/\/\/\/\?????< ? ??/\/\/\/\?????
MOUTHPIECE ? ??????? ??\? ? ??????? ? EARPIECE
? ? +9Vdc ? ? +9Vdc
???????2 ?9 ??????)???O ? ???????2 ?9 ??????????O
? _?____?_ ??????? 100uf ? ? _?____?_ ??????? 100uf
?????\4 6/??????? 10uf? ??????? ?????\4 6/??????? 10uf?
? f \ 1/??????????? ? ? ? f \ 1/??????????? ?
??????????\ /??/\/\/\/\?? ? ? ??????????\ /??/\/\/\/\?? ?
????? 7 \/ 8 ??????? ? ? ? 7 \/ 8 ??????? ?
????? ? ? 5 1.5K^ ????? ? ????? ? 5 1.5K^ ?????
??? ? ? ??? ? ??? ? ???
? ? __?__ ? ? ? __?__ ?
? ????? 200 uf ? ????? 200 uf
? ? ? ?
? ? ? ?????> To earphone.
? ? ? (directly to an 8ohm load)
? ? ? 1/2 Watt
? ? Signal (+) side ? (recommend smal earphone)
??????)???????????????????????????????????????????????????????????????????????
? ? Two lead telephone cable ? ? (pretty poor Zener
? ? strung with parallel circuitry ? huh?)
? ? in mind. ? 6V
? ? ?
?????????????????????(???????????????????????????????????)????????????????????
Ground (common side) ? Sb ???Piezo buzzer ? (3-12V) ?
????O O???????????????????????????)???? ?
????? ? ??? ???????????? ?? NPN ?
Push "Sb" to make ? ??/\/\/\/\?????? (general ?
EVERY FLIPPIN' BODYS O +9Vdc ??? purpose) ?
buzzer go off. Yup, This ^ ??????????????
is a party line. Gotta play with this value
depending on the buzzer. If
The 1.5K ohm pot on pin 8 and the you want to be fancy, use a logic
cap on pin 1 form a method of adjusting gate.
the "GAIN" of the amplifier from about 20
to about 200. (I used a single section like this in one of the local
churches for the hard of hearing. I ran them off an amplifier used by the
pastor. When the pastors amplifier was shut off and when adjusted to max,
they kept complaining about picking up PBS.)
The 10K ohm pot on the inputs (pin 9) is what you use as the "VOLUME"
control.
Transposing this stuff to ASCII aint the easiest thing I've ever done,
so don't be surprized if I made some mistakes. (I'd be surprized if I
didn't). If (when) you find any, please NET-MAIL me or .TIC me the
correction(s). (9:1992/209 or 1:132/209) Thanks. I hope this helps.