electronic gong

MEM and fed to pin 8 of IC1. Preset potentiometer can then be used to set the output level while P2 adjusts the frequency of the second gong. It should be pointed out that long lead lengths to the remote buttons may cause false triggering. This can be avoided by including a resistor in series with switch Si and a small capacitor between pin 1 and supply common. The low quiescent current con- sumption of 1μA means that a single battery will last for a very reasonable length of time. electronic gong The bipolar integrated circuit type SAB 0600, from Siemens, is yet another sound IC. However, this particular device is different as it is designed to give a harmonic sound, which makes a welcome change from the more common "beeps", "whistles" and "plops". If and when the SAB 0600 becomes available in the U.K., it will be possible to construct a complete miniature electronic gong with very few external components. The device requires very little current, in fact a small battery is suffi...