Figure 3 and Table 3 show the possibility of using two universal logic elements as an RS-trigger. When a short rectangular pulse is applied to the input X1 or X2, the trigger switches its state.

The transistors used (a 2N3055 npn and 2N2955 pnp in TO-220 packages) are reasonably good choices. They should be placed on a heat sink for good heat dissipation.

Logical microcircuits in transistor cans are now being offered by four major companies: Fairchild Semiconductor Corp., Raytheon Co., Philco Corp., General Instrument Corp., and ...