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Most of the small musical bands have up to four string instruments like guitars and violins. The signal from the transducers of these instruments should be buffered and sometimes amplified before it is sent to the next stage of processing. Although most of the WUDQVGXFeUV, DOVr NQrwQ DV SLFNXSV, SUrYLGe VLJQLfiFDQW VLJQDO, VrPe DGGLWLrQDO DPSOLfiFDWLrQ FrXOG Ee XVeIXO. Also, sometimes adding distortions to the signals of all the instruments can give an interesting effect.

This simple circuit can support up Wr IrXU VWULQJ LQVWUXPeQWV wLWK eOeFWULFDO SLFNXSV DQG wrUNV DV D PLxeU, SUeDPSOLfieU, GULYeU DQG GLVWrUWLrQeU DOO DW WKe VDPe WLPe wLWK DGMXVWDEOe JDLQ.

AV VKrwQ LQ WKe GLDJUDP, LW LV EXLOW DUrXQG D VLQJOe rSeUDWLrQDO DPSOLfieU ,C 1(5534 (,C1) IeDWXULQJ Orw-QrLVe, KLJK-JDLQ, Orw WrWDO KDUPrQLF GLVWrUWLrQ (7HD) DQG WKe FDSDELOLWy Wr GULYe 600-rKP OrDGV. 7Ke FLUFXLW wDV rULJLnally designed for guitars and violins wLWK PDJQeWLF SLFNXSV EXW SUrYeG Wr be useful for other string instruments and other types of pickups too.

7Ke wrUNLQJ rI WKe FLUFXLW LV VLPSOe. There are four input connectors (CON1 through CON4) for string instruments. The input resistance is around 1 kilorKP, DGMXVWDEOe PDLQOy wLWK WKe YDOXe of resistors r1, r2, r3, r4 and r5. This much input resistance is appropriate for most of the pickups but can be changed by changing the values of these resistors