| A symmetrical power supply may be designed from two standard opamps, but it can only provide a small current (of the order of a few mA).
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| The measurement card for the indoor /outdoor thermometer "may be provided with the additional LED indicator shown in the diagram to check...
| With the availability of portable CD players, a need has arisen for a means of connecting such a machine to the radio-cassette player now...
| Nickel-cadmium battenes should normally be charged at 1/10 their eapacity in Ah. The capacity of a 9 V NiCd battery is usually 110 mAh an...
| In order to simplify the transmitter and to improve the noise immunity of the remote control receivers described in his earlier article, M...