Looking for a small project to fill void

[Wiginometry]

Does anyone know a good small project that can be shoved onto a small (1 1/2" by 1 3/4") board

Preferably something involving 555, 556, or 358 chips if not that cool too just trying to use up old stock.

 

[Terry01]

Flashing led ? ? ?

 

[Wiginometry]

I thought about that but i cant seem to think of a good practical use for one.
Other than entertaining the kiddos.

 

[AnalogKid]

Intercom.

 

[Wiginometry]

Intercom.

Now that's something I can get on 'board' with...
Haha.... Ok so my humor is a bit dry but
"Now for something completely different" !!!!!

You wouldn't happen to have a schematic for the intercom in question would you?

 

[AnalogKid]

https://images.search.yahoo.com/sea...ZWMDcGl2cw--?p=Intercom+schematic&fr2=piv-web

Many intercom circuits are a simple microphone amplifier with a switching arrangement to swap the inputs and outputs. More fun is a switchless, hands-free circuit:

Q1 is operating as a variable current sink driver. It's output impedance is high enough for 2 or 3 stations. The next step beyond this is to replace Q1 with a Howland current source. With that, you can have many (and a varying number of) stations on a single intercom bus. Many TV, stage, and film productions sets use that type.

ak

 

[Wiginometry]

Sweet that looks like it'll keep me occupied for an afternoon or late night if insomnia hits...

 

[Wiginometry]

I'm always game for more ideas or things that will help improve my skills.

Sometimes you have to fail to succeed.

 

[73's de Edd]

Sir Wiginometry . . . . .

Just in case some . . . or ALL . . . . of that circuits Resistor /Capacitor values have slipped your mind . . . . . .

The rest of the story . . . . . .

https://www.eeweb.com/extreme-circuits/full-duplex-intercom

BTW with that stage being nulled out with R7 pot, I see that designs circuitry treatment of
C4 electrolytic polarity, being correct, as it is shown.

73's de Edd