Parts List for Electronic CO2 Controller

None of these parts are especially critical -- just about anything should work.  All parts are available at Radio Shack
CAPACITORS:
C101         100u electrolytic *
C102         0.01u
C103         0.1u **
C201         1uF electrolytic *
C202         0.01uF
C203         0.1uF **
C205         0.1u
* Leakage in the timing electrolytic capacitors significantly affects their performance.
(Actual time intervals may be considerably lower than calculated.)

DIODES:
D201         1N914 or similar (not at all critical)
D202         1N914 or similar (not at all critical)
D203         LED                     (not at all critical)
RESISTORS (1/4 WATT, 5%):
R101         10k
R102         1k
R103         1Meg variable *
R201         10k
R202         1Meg variable *
R203         100k
R204         1k
R205         100 (The LED in the Solid State Relay seems to need a lot of current.)
* Keep leads short in this high impedance part of the circuit.
IC's:
Pulser        555 Timer IC (or 1/2 556)
Timer        555 Timer IC (or 1/2 556)
Solid State
Relay         Sharp S101S05V (Radio Shack stocks this,  part number 275-310)
OTHER:
Small 5 volt DC supply (e.g the Radio Shack 273-1454 6 Volt 150mA "wall wart" style -- about $8.00).  It doesn't need to put out much current, but should be well regulated.  Just about anything should do.
 


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