I wanted to build a cooling temperature controller for some time now. The purpose was to experiment with microcontrollers and temperature controls.
For the cooling I’m using a peltier element.
The circuit board:
Pictures:
Category: Projects
Aug 13 2007
Function Generator – Update
The L165 opamp I used turned out to be too slow, so I made a new pcb with different opamps. This time I used 2x THS3112.
Pictures:
Yes, the voltage regulators are not mounted straight 
.
Because I had no 7909 I used a 7905 with a 4.7V zener, this way I get -9,7V.
This pcb is not tested yet, so I don’t know if it works.
Aug 13 2007
Window controller – Update
Because I made some mistakes on the circuit board, I have made a extra circuit board for driving the power transistors.
Aug 22 2007
TDA2030 Amplifier
I’m building a portable amplifier with an build in mp3 player. Today I made the amplifier pcb.
Circuit:
 |
R1, R2, R3 | 100 K |
| R4 | 4K7 | |
| R5 | 150 K | |
| R6 | 1 Ohm | |
| C1 | 1 µF | |
| C2 | 22 µF | |
| C3 | 2,2 µF | |
| C4 C5 | 100 nF | |
| C6 | 220 µF 40V | |
| C7 | 2200µF 16V | |
| US1 | TDA2030 |
Pcb layout: With components ; Without components.
Pictures::
Aug 23 2007
Parallel port interface – Update
I started building a new version with 8 triacs to drive light bulbs.
Aug 23 2007
TDA2030 Amplifier – Update
Today I made the power supply pcb. It has 2 outputs for the amplifiers and a variable voltage for the mp3 player. The variable voltage is made with a LM317.
All together
The Pcb layout: With components ; Without components.
Aug 26 2007
IN-12 Nixie Clock – Update
Yesterday I received my nixies (Thanks Robert and Pascal!), today I started experimenting with them.
Datasheet:
The socket:
Sep 02 2007
IN-12 Nixie Clock – Update
Today I have made a drawing of how the clock is going to look like:
Dutch 
