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Serge Ring Modulator Schematic

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1 2 3 +V X TRIM +V 220K 22K 100n 330R 100n 100n D -V 4 +V -V 150K 100n 22p 68K +V D -V X DC IN 7 +V 22K 7 2 6 470n 2 330R 6 68K 3 3 RM OUT U1 CA3080A U2 TL071 4 4 330R 5 X AC IN 22K 15K C -V C -V +V +V 47K Y TRIM 22K LIN INITIAL AMPLITUDE 220K 22K Q1 BC559 -V Q2 BC559 47K 47K 470n Y AC IN Y DC IN +V 1K 1K 47K B B 1N4148 SERGE RING MODULATOR Q3 BC559 220K +V 2001. Marjan Systems Drawn by Marjan Urekar 220K 2K2 22K CV GAIN surf.to/marjansystems [email protected] IN ORIGINAL OLD SERGE COMPONENTS WERE : U1 = CA3080E, U2 = LM307N, DIODE = 1N914 Q1,2 WAS PNP PAIR 2N4196 (USE MATCHED DISCRETE PNPs) Q3 = 2N4250 (USE ANY PNP) 22p CAP ADDED TO PREVENT OSCILLATIONS (NOT IN ORIGINAL) TRIMPOTS WERE 25K INSTEAD 22K +/-V = +/-12V A 1 2 3 4 A