![]() ![]() 4066), but IMO they do not qualify as hi-fi. It's also possible to use CMOS analogue switches instead of relays (e.g. A rotary switch allows up to 12 inputs, and various logic systems as shown here may allow up to six or nine without change, and potentially many more if you need them. The most common would be Phono, CD, DVD, Auxiliary (Aux.) and TV, but many people have other input requirements as well, so five may not be enough. Typical inputs are shown in brackets in Figure 1, but naturally these would be adapted to suit your needs. ![]() I haven't included touch switches here, but may add a touch switch project at a later date. Once relays are used, you can also use electronic switching, which provides the ability to use a remote control, touch switches or any other arrangement that can be adapted to switching relays. Even when located at the back of the preamp chassis, they are still a pain to wire.īy using relays to perform the switching, you only need a single pole switch, and they are readily available with up to 12 poles - enough for everyone I expect. In most cases, rotary switches can only provide a maximum of six double pole switches, and if you happen to need more inputs then you're out of luck. This makes wiring easier because all leads are very short, but you still need the multi-position two-pole switch, with as many poles as there are inputs. One can use an extension shaft (such as the ES-250 from ESP) which allows the switch to be located at the rear of the enclosure. There really isn't a 'friendly' way to do it, and it's made harder if the switch is at the front of the cabinet because all wiring needs to be shielded to prevent noise. This is convenient and fairly cheap, but you need a multi-position two-pole switch, and wiring all your inputs to it can be tedious (to put it mildly). Most preamps will use a simple rotary switch to select the desired input. ![]()
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