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Parts List

 
Element Value/Type Case Remarks
R1 100k 1206   
R2 100k 1206   
R3 10k   Potentiometer
R4 30k 1206   
R5 10k 1206   
R6 10k 1206   
R7 7k5 1206   
R8 7k5 1206   
R9 500R   Potentiometer
R10 500R   Potentiometer
R11 5k1 1206   
C1 100n 1206   
C2 100n 1206   
C3 100n 1206   
C4 100n 1206 Do Not Assemble
C5 100n 1206 Do Not Assemble
C6 100n 1206 Do Not Assemble
C7 100n 1206 Do Not Assemble
C8 100n 1206 Do Not Assemble
C9 100n 1206 Do Not Assemble
C10 22u/6V SMD A   
C11 10n 1206 Optional element - protect Q1 against voltage peek after switch off fan. Most of the computer type fans which I tested didn't produce  voltage peeks dangerous for Q1
C12 10u/50V     
L1 47u 1210  Do Not Assemble - cross PCB pads
D1 DIODE  SMD A Optional element - protect Q1 against voltage peek after switch off fan. Most of the computer type fans which I tested didn't produce  voltage peeks dangerous for Q1
D2 DIODE SMD A e.g. SK310A
U1 7805 TO-252 Voltage regulator +5V, e.g. LM7805
U2 7812 TO220 Voltage regulator +12V, e.g. LM7812
U3 ATMEGA8 TQFP32   
LCD GOLDPIN 1x16   
J1 GOLDPIN 1x2 FAN_CON - fan connector
J2 GOLDPIN 1x1 +12V_CON - optional +12V supply connector
J3 GOLDPIN 1x1 +35V_CON  - main supply connector
J4 GOLDPIN 1x3 ground and measured signals
S1 SWITCH     
Q1 MOSFET N SOT-23 e.g. BSS-138 (fan current lees than 200mA)

 

 

Programming cable connection list

 
LCD Pin number LCD signal ΅C signal/Pin Prog signal
1 GND GND GND
2 VCC VCC VCC
4 RS SCK / PB.5 SCK
5 RW MISO / PB.4 MISO
6 EN MOSI / PB.3  MOSI
10 D3 RESET RESET