A SIMPLE INTERVAL‐PROGRAMMING CIRCUIT1
Fogle C. Clark, Carter W. Caudill · Journal of the Experimental Analysis of Behavior · 1960
A reinforcement lock-up unit for use with interval schedules is described.The circuit is designed to be used with Gerbrands punched-tape programmers or with cam timers.The unit can be inexpensively constructed, yet provides the same features as commercially avail- able units.It is easily used in simple Fl's or VI's, in "limited-hold" schedules, in mul- tiple or conjunctive schedules, or as a self-recycling timer.A circuit diagram is presented in Fig. 1.The unit is constructed on a snap-on panel for attachment to 24-volt D. C. power rods.The A. C. line current for the timer motor is brought in separately through a plug, and may be externally switched.External connections to the timer motor and switch are also made through a Jones plug and socket.All 24-volt D.C. switching terminals are brought out to Nu-Way connector studs on the front panel.If inexpensive relays are used (e.g., Relay A, Potter and Brumfield Type KA1 D, and Relay B, Potter and Brumfield Type MH17D), the cost of parts for the unit will run about $15.00; with telephone types (e.g., Clare Type J), costs will be $5.00 to $10.00 more.