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. 2009 Mar;91(2):253-5.
doi: 10.1901/jeab.2009.91-253.

A simple 2-transistor touch or lick detector circuit

Burton Slotnick  1
Affiliations

A simple 2-transistor touch or lick detector circuit

Burton Slotnick. J Exp Anal Behav. 2009 Mar.

Abstract

An easily constructed and inexpensive battery operated circuit is described for use as a lickometer or contact detector in behavioral studies with rodents.

Keywords: contact detector; lickometer; touch circuit.

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Figures

Fig. 1
Fig. 1
Battery operated touch detector circuit. R1 and R2, 10 megohm resistors. R3, 47K ohm resistor. T1 and T2, 2N2222 transistors. E, B, C, indicate the emitter, base, and common lines of the transistors. D, diode. Ra, pin numbers of a 14 pin DIP socket and the corresponding positions of normally open and common relay contacts, and the relay coil (as viewed from above the relay). Ta shows the position of the transistor emitter, base, and common lines viewed from its flat surface. Da, the positive and negative connections of the diode.
See this image and copyright information in PMC

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