Item Tag: United States

RELAY PROTECTION FOR HAFLER 200 SERIES AMPS The Speaker Protection Circuit Board has two main functions: to protect the audio amplifier and the loudspeakers during start-up sequence when the amplifier might output DC voltage, and to protect the loudspeakers in the unlikely event of an amplifier power stage failure, where DC component would damage the speaker. The circuit is a simple discrete design incorporating 3 transistors, 3 diodes, and 1 Zener diode. Relay power is derived from the AC secondary across one AC Terminal of the Rectifier. This is required for quick relay disengagement when amp is shut down or power failure occurs. Approximately a 3-second Turn-On Delay is created by a simple RC circuit. DC Output Monitoring is accomplished using positive and negative low pass detectors triggering when DC is present in the amplifier output above +/- 1 volt for an optimized time constant. Left and right channel impedance is offset for circuit compatibility use with bridged amplification. Two separate 24-volt Relays in series (20-amp min. rated contacts) ensure two channel disengagement if one fails. The relay circuit also incorporates a resettable PTC fuse. Created to work with the Hafler 200 series amplifiers. Designed in the USA. THIS KIT MAY BE INSTALLED IN HAFLER ORIGINAL 200 SERIES POWER AMPLIFIERS TO ENABLE EASY RELAY PROTECTION WITH DELAYED TURN ON CONVERSION. COMES WITH INSTRUCTIONS AND 36 COLOR PICTURES FOR REFERENCE. THERE ARE THREE BASIC RULES FOR SUCCESS IN ELECTRONIC KIT BUILDING: 1. READ THE INSTRUCTIONS CAREFULLY AND FOLLOW THEM 2. MAKE SECURE SOLDER CONNECTIONS WHICH ARE BRIGHT AND SMOOTH 3. CHECK YOUR WORK CAREFULLY AFTER EACH STEP FATIGUE INCREASES THE RISK OF ERROR, SO TAKE A BREAK RATHER THAN PUSH FOR EARLY COMPLETION. YOUR WORK AREA SHOULD HAVE GOOD LIGHTING, THE PROPER TOOLS, AND A PLACE WHERE THE PICTORIAL DIAGRAMS CAN BE VIEWED WITHIN EASY REACH FOR CHECKING. THE TOOLS SHOULD INCLUDE: A 40 TO 100 WATT SOLDERING IRON WITH 3/16 OR ¼ TIP WHICH CAN REACH AT LEAST 600 DEGREES F. ROSIN CORE SOLDER (SUPPLIED) A DAMP SPONGE OR CLOTH TO WIPE THE TIP OF THE IRON A WIRE STRIPPING TOOL FOR REMOVING INSULATION FROM 26GA TO 16GA WIRE A MEDIUM-BLADE SCREWDRIVER SET OR 4 IN 1 SCREWDRIVER NEEDLE-NOSE PLIERS SMALL DIAGONAL OR SIDE-CUTTING PLIERS PLIERS NUT DRIVERS OR MINI SOCKET SET NOTE: BEFORE PERFORMING THE UPGRADE, MAKE SURE THE POWER SUPPLY AND AMPLIFIER ARE IN SOUND WORKING ORDER. QUA-CO LLC ASSUMES NO RESPONSIBILITY FOR IMPROPER ASSEMBLEY, FUSING OR INSTALLATION CAUSING AMP OR SPEAKER FAILURE. IF YOU ARE INTERESTED IN HAVING THIS UPGRADE INSTALLED PROFESSIONALLY BY A QUALIFIED ENGINEERING SERVICE, PLEASE EMAIL ME FOR CONTACT INFORMATION. THANKS FOR LOOKING.