Aquarium automatic temperature constant circuit

Published:2011/8/26 3:07:00 Author:Jessie | Keyword: aquarium, temperature constant | From:SeekIC

When the temperature of water below the set temperature (tropical fish is usually 23-27℃), 3AX31's Iceo is lower, its resistance increases,a isthe low level, it will output high potential after IC1A reversed-phase, VT2 connected, relay j1 suck close, hot converter R4 works. Conversely, a is the high level, VT2 stops, j1 releases, R4 blackouts. Thermal componentsshould choosegermanium transistors 3AX31, 3AX34 with better temperature curve.The inverter chooses CD4049 or CD4069. Power transformeruses 10V ,2-5W small transformers. The tank thermostat is suitable for tropical fish breeding feeding enthusiasts, andthe circuit issimple and effective.



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