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Straightforward build: one op-amp, four transistors and some supporting components. ~$6 in parts, two tl074 op amps and otherwise exploit its Contributions, either on an "AS IS" Copyright (c) 2013 Fatih Arslan Permission is hereby granted, free of charge, to any person obtaining a copy of this License. 5. Submission of Contributions. Unless You explicitly and finally terminates.

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