> Van: Lalakis Parafyadas <lalakis_hack@HOTMAIL.COM>
> Aan: PICLIST@MITVMA.MIT.EDU
> Onderwerp: [OT]: 1Hz frequency generator with NE555 timer
> Datum: dinsdag 7 december 1999 15:04
>
> Hi there. I'm interested in making a 1Hz frequency generator with a NE555
> timer. What resistors, capacitors do I need and how should I connect them
to
> the chip? Thanks in advance, Argiris

Hello Lalakis,

  From the top of my head:

  Connect Pin 8 & 4 to VCC, Pin 1 to GND.  Connect a resistor from VCC to
pin 7 (example: 12kOhm).  Connect a somewhat smaller resistor from pin 7 to
pin 6 (example: 10kOhm).  Connect pin 6 to pin2.  connect a capacitor from
pin 2 to GND (example: 100uF).  Connect a resistor of 560 Ohm from pin 3 to
the Annode of a Led. connect the Cathode of the Led to GND.  Pin 5 does not
have to be connected.

Blinking-speed can be changed by changing any of the resistors and/or
capacitor.
For variable speed: place a 10 - 500 kOhm potmeter in series with the
12kOhm resistor.

VCC can be anywhere from 3 to 16 Volt.

Regards,
  Rudy Wieser