Global Specialties PB-501 - Manual - Manual (Page 6)

6
PRODUCT DESCRIPTION
The Global Specialties Model PB-501 Logic Designer is a complete digital circuit design
instrument. It can full fill modest requirements for the design and study of gates,
counters, multiplexers and can even interface directly to a microprocessor.
The unit contains 8 LED logic indicators, 8 logic switches, a clock and two debounced
pushbuttons. The logic indicators are a "transparent latch" and thus serve the dual
function of 8 independent logic probes or two four bit output ports which can be
connected to a microcomputer. Similarly, the eight logic switches can serve the dual
function of logic switches or two four bit input ports for interfacing to a microcomputer.
The clock is fixed at approximately 1 KHZ but can be varied by adding an external
capacitor. *See Addendum
All of these functions are internally connected to a solderless interconnect socket with 5
tie points for each signa l, In addition, a “solderless breadboarding socket" is
permanently attached to the unit, thus providing a convenient work area for the circuitry
being designed or studied. Both sockets allow insertion of components or wires up to
20 gauge in size.
Power is supplied either internally by batteries or by an external 5 volt regulated supply.
The unit is housed in a durable and attractive plastic box with a hinged protective cover
thus making it portable and stackable for storage purposes.