Abstract: A toy construction set comprising operatively interconnectable blocks and connectors. Each of the blocks has one or more apertures formed in relief Each of the connectors has a base in the form of a plate or rod and a plurality of pins attached to the base in a spaced apart arrangement for interconnecting blocks. The pins are integral with the base plate. The interconnection between a block and a connector is achieved by the pins being positively engaging and releasably retained within one or more of the apertures of the blocks. The pins are oppositely disposed of a base plate so that a block can be connected to a connector on one side of the base plate, and another block can be connected to the same connector on the other side of the plate.

Abstract: A toy construction set comprising operatively interconnectable blocks and connectors. Each of the blocks has one or more apertures formed in relief. Each of the connectors has a base in the form of a plate or rod and a plurality of pins attached to the base in a spaced apart arrangement for interconnecting blocks. The pins are integral with the base plate. The interconnection between a block and a connector is achieved by the pins being positively engaging and releasably retained within one or more of the apertures of the blocks. The pins are oppositely disposed of a base plate so that a block can be connected to a connector on one side of the base plate, and another block can be connected to the same connector on the other side of the plate.

Abstract: A hybrid active-passive signal bandpass filter comprising an active filter arranged in use to operate at a fundamental frequency which is a sub-multiple of a desired filter frequency of the bandpass filter, and a passive filter arranged in use to eliminate any pass bands in the frequency response of the active filter other than at the desired filter frequency for providing the pass band signal of the bandpass filter.