8 7 6 5 4 3 2 1 D1 12V 1N4004 12VDC IN D 2 1 2 x SCREW TERMINAL D2 CIRCUIT BREAKER U1 UA78L05ACLP 3 Vin 1N4004 1 Vout GND F1 RUE160 J1 VCC 2 D3 RED LED C3 1uF 16V C2 0.22uF C1 100uF 25V D + + R1 1K Vpp/THV VCC GND PGD PGC PGM AC FREQ ON TIME OFF TIME R3 3386P-1-502 5K TRIM VCC R4 3386P-1-502 5K TRIM VCC R5 3386P-1-502 5K TRIM VCC 1 2 3 4 5 6 ICD2 PORT J4 RJ11-6L-B J5 GND RX VCC TX VCC 1 2 3 4 C SERIAL COM PORT C AMP 640456-4 R7 10K C4 20pF Vpp/THV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 X1 4 MHZ CRYSTAL R6 39R C5 20pF U2 PIC16F876A-I/SP MCLR RA0/AN0 RA1/AN1 RA2/AN2/VrefRA3/AN3/Vref+ RA4/T0CKI RA5/AN4/SS Vss (-) OSC1/CLKIN OSC2/CLKOUT RC0/T1OSO/T1CKI RC1/T1OSI/CCP2 RC2/CCP1 RC3/SCK/SCL D4 BICOLOR LED (2-PIN) S1 28 27 26 25 24 23 22 21 20 19 18 17 16 15 RB7/PGD RB6/PGC RB5 RB4 RB3/PGM RB2 RB1 RB0/INT Vdd(+) Vss (-) RC7/RX/DT RC6/TX/CK RC5/SDO RC4/SDI/SDA PGD PGC JUMPER S2 JUMPER PGM S3 MANUAL B3F-3120 VCC RX TX C6 0.1uF R2 1K B B L1 R8 100R J2 Q1 VNP28N04 2 1 12V ~70VAC OUT 2 X SCREW TERMINAL 70000K 7VAC TRANSFORMER R9 100R Q2 VNP28N04 Soundsculpture Incorporated / USITT TD&T Magazine Hardware and Software by James David Smith diy@jamesdavidsmith.com To DIY For: Telephone Ringer A Size A3 FCSM No. A DWG No. Scale 1 2 3 4 Rev 1.1 Sheet 1 of 1 5 6 7 8 This easy-to-build circuit has only thirty-one parts, many of which are simple resistors and capacitors. 32 THEATRE DESIGN & Copyright 2007 United States Institute for Theatre Technology, Inc. TECHNOLOGY WINTER 2007