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Sadly enough, the popular Philips SAA3049 remote control decoder IC is no longer available. No semiconductor foundry offers a replacement type, probably because nowadays remote-control decoding in consumer electronics is performed by customer-specific microcontrollers. We can do the same ourselves

The SAA3049 checks and converts received coded data (RECS80/RC5) into latched binary outputs. The device address can be hard-wired for a particular address allowing several devices in one location. Alternatively, received data with any address can be accepted, the received data and address

The joysticks used in games and modelling contain two potentiometers with a resistance of about 100 k?, which turn through 60 to 90 degrees. In fact only one third to one quarter of the total resistance is used in these potentiometers. The diagram shown here should be used when making your own joyst

At our editorial offices we are surprised (and delighted) how often we are being asked about relatively ancient circuits. In not a few cases, these circuits contain components that are currently no longer available, such as, for example, the 1 K size EPROM 2708, which required three(!) power supply

Since Ferranti have taken their well-known ZN436, a 6-bit digital to-analogue converter, out of production, the ZN426 has 'replaced' it. This is, however, not a direct re placement, because, to start with, it is an 8-bit device. lt is also not fully pin compatible as the diagram shows.

The circuit shown in the diagram may prove useful when a 79xx voltage regulator needs to be replaced by a better quality type for which there is not enough space. lt may also prove useful when a slightly different voltage is required.

The circuit shown in the diagram may prove useful when a 78xx voltage regulator needs to be replaced by a better quality type for which there is not enough space. lt may also prove useful when a slightly different voltage is required.

One of our lab interns got inspired after reading our article on an LDO replacement (November 2012 edition, [1]) and took a shot at developing his very own version of this circuit. He stard out with ideas only, and ended ith a few more.

While setting up a test with his ‘switching 7805 replacement’ project (November 2012 edition) for the purpose of generating some better ‘scope screenshots for his webinar on the subject (webcast on November 22, 2012), designer Raymond Vermeulen noticed a slight irregularity in the circuit’s

had taken the TCA280A out of production without prior warning, and that no pin-compatible replacement was available.