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Gold Member Username: Mikechec9Http://www.cardomain.c... Post Number: 1027 Registered: May-05 | curious- 1) What does the "*C" denote? How does it relate to the amp's power supply? 2) What is the primary benefit of an amp with the generally preferred 105*C capacitors over the more common 85*C? 3) Why not just step up to 105*C if the advantage is so significant? examples of 105*C amps? |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 1067 Registered: Mar-04 | *C is degrees Celcius. 85*C's are prolly less expensive for the company that makes the amp. |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 10496 Registered: Dec-03 | yup.the higher the tolerance or tighter the tolerance, the more they cost to produce, but the more abuse tehy'll take, the longer they'll last, or the more accuraate they'll be. "Pros and Cons of Regulated / Unregulated Supplies Some designers try to keep their supplies regulated down to battery voltages as low as 9.5 volts. The supply compensates by increasing the current. The current increases dramatically at the lower voltages. Because of higher currents at the lower voltages, the supply efficiency drops further, requiring even more current. At higher voltages, the pulse width reduces, causing increased ripple current. This high current creates heat in the filter capacitors and can destroy the capacitor's electrolyte. Some manufacturers do not use capacitors of sufficient quality for this range of regulation. These amplifiers may not perform up to specification just one year after installation. Also, the extra current at low voltages is extra hard on a battery that is already suffering! So, I recommend that amplifiers stay in regulation down to about 11 - 11.5 volts. Any properly working charging system can easily keep the battery voltage well above this." |
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Gold Member Username: Mikechec9Http://www.cardomain.c... Post Number: 1035 Registered: May-05 | studying your take on PWM posted a few weeks back. comparing the principal to a/b class ferrite caps. cross ref and clarifying |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 10536 Registered: Dec-03 | http://www.wickedcases.com/caraudio/amplifiers.html at the top section.. talks about power supplies. covers capacitors as well in that section. I need to revise that paper and add anchors later. |