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I dont intend to go into the ins and outs of this circuit, just how to make it. you can save pennies by using reclaimed components from old circiut boards but these parts are all cheap and readiy available. The Circuit here is 144Hz and R2 (10k) is not needed for my needs, The circuit below is for a fan and R2 switches the fan on in a PWM failure ie fail safe.
The PWM cct only uses 1ma
Parts
Strip Board
1 x 100 nf Capaitor
1 x 1 uf Capaitor
1 x 555 timer chip
1 x 8 pin socket (optional)
2 x diodes (not zenner)
1 x 100k Potentiometer
22 awg wire
Transister (suitable for your project)
Project box.
Tools
wire cutters
solder
soldering iron
5mm drill bit
saw
The PWM cct only uses 1ma
Parts
Strip Board
1 x 100 nf Capaitor
1 x 1 uf Capaitor
1 x 555 timer chip
1 x 8 pin socket (optional)
2 x diodes (not zenner)
1 x 100k Potentiometer
22 awg wire
Transister (suitable for your project)
Project box.
Tools
wire cutters
solder
soldering iron
5mm drill bit
saw
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Signing UpStep 1Prepare strip board
Strip board consists of copper strips with holes predrilled at 1/10 inch pitch. The components sit on the plain side the legs then solder to the tracks.
The tracks under the ic will need cutting to do this a 5mm drill bit is used this will remove the copper track where it is needed.
For this project we will use a small piece of strip board 12 strips wide and 1 1/2 inch long.
Remember when cutting the tracks the underside is in reverse
The tracks under the ic will need cutting to do this a 5mm drill bit is used this will remove the copper track where it is needed.
For this project we will use a small piece of strip board 12 strips wide and 1 1/2 inch long.
Remember when cutting the tracks the underside is in reverse
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