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Chip Amps Amplifiers based on integrated circuits

Chip amp power supply- a beginners guide
Chip amp power supply- a beginners guide
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Old 11th January 2009, 07:58 PM   #71
Nuuk is offline Nuuk  United Kingdom
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Do you mean after the rectifier bridge?
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Old 11th January 2009, 07:59 PM   #72
raypalmer is offline raypalmer  Canada
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Yeah. The bridge, sorry. I don't sprekken the lingeddy very well.
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Old 11th January 2009, 08:01 PM   #73
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Click the image to open in full size.

or read the DD site very well!
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Old 14th January 2009, 02:50 PM   #74
raypalmer is offline raypalmer  Canada
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Ok, so I've got a spare rectifier board from my peter daniel kit. Presumably I can use this (paired with an appropriate transformer) to power a dantimax control board for a remote controlled linestage?
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Old 14th January 2009, 03:51 PM   #75
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Yes, if it is a split rail supply.
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Old 15th January 2009, 10:57 PM   #76
raypalmer is offline raypalmer  Canada
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Alright so I've tested my psu. I have an amveco dual secondary/dual primary toroid. It's rated at 140VA with 24V per secondary.

Now I thought the Voltage was supposed to be 1.4 times greater after the bridge? But I measured 24V DC on the nose coming out of my rectifier. I'm thinking I was wrong about the 1.4 factor, just want to make sure I'm not headed for a catastrophe.
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Old 16th January 2009, 08:06 AM   #77
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Quote:
Originally posted by raypalmer
Alright so I've tested my psu. I have an amveco dual secondary/dual primary toroid. It's rated at 140VA with 24V per secondary.

Now I thought the Voltage was supposed to be 1.4 times greater after the bridge? But I measured 24V DC on the nose coming out of my rectifier. I'm thinking I was wrong about the 1.4 factor, just want to make sure I'm not headed for a catastrophe.
Do you have a load connected to your bridge? If not, connect a capacitor across it and measure again.
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Old 16th January 2009, 04:44 PM   #78
L700 is offline L700  Malaysia
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i wanna ask currently i have 1 30v 300va tranny after the bridge i get 46.6v .... ? i not yet connect to GC ... i scared to burn my chip its LM3886 can support up to 80v ?
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Old 16th January 2009, 05:02 PM   #79
AndrewT is offline AndrewT  Scotland
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|Vcc|+|Vee|<=84Vdc.
If a dual polarity supply is used then <=+-42Vdc.
this is absolute max for which National Guarantee the Chip.

But, you must allow for worst case conditions. Maximum mains supply voltage, minimum current draw from the PSU (all but one channel disconnected)

The normal maximum transformer voltage is 28Vac but many builders refuse to go higher than 25Vac when driving 8ohm speakers.
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Old 17th January 2009, 10:55 AM   #80
L700 is offline L700  Malaysia
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Quote:
Originally posted by AndrewT
|Vcc|+|Vee|<=84Vdc.
If a dual polarity supply is used then <=+-42Vdc.
this is absolute max for which National Guarantee the Chip.

But, you must allow for worst case conditions. Maximum mains supply voltage, minimum current draw from the PSU (all but one channel disconnected)

The normal maximum transformer voltage is 28Vac but many builders refuse to go higher than 25Vac when driving 8ohm speakers.
thanks .... i dunno y after the bridge it soo high voltage
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