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The TDA1521 common accompanying sound circuit of color tv

2014-11-27 20:52  
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The TDA1521 common  accompanying sound circuit of color tv
The circuit is from CHANGHONG C2191.The rejoining method is OTL dual audio track .The function of pin of TAD and voltage for reference:1st foot:11V——reverse input 1(input of L audio track signal )2nd foot:11V—— positive input 13rd foot:11V——refer to 1(when the rejoining method of OCL is 0V,when the rejoining method of OTL is 1/2Vcc)4th foot:11V——output 1(output of L audio track)5th foot:0V——input of negative power-supply (when the rejoining method is OTL earthing)6th foot:11V——output2 (output of R audio track signal)7th foot:22V——input of positive power-supply8th foot:11V——input 2 of positive direction 9th foot:11V——input 2 of reserve direction (input of R audio signal)