alteration of the power supply from the power amplifier Harman Kardon HK870 at 220. - diyAudio
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Old 11th December 2012, 12:30 PM   #1
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Default alteration of the power supply from the power amplifier Harman Kardon HK870 at 220.

Greetings! Please inform parameters transaformatora T1. I want to remake it under the power of 220 volts. Power switch is not found. Version of the adapter does not fit, because in addition to the American amp powered devices are a few pieces in the front - and a number of adapters tired. Service manual for my model here Скачать manual Harman Kardon hk870 Service Manual. Most likely, the trans will wind itself, and for this you need to know the options. Like, if I understand correctly, this should limit winding trance T1 and replacing the capacitor C1.
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Old 11th December 2012, 01:01 PM   #2
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Originally Posted by alexkmp3 View Post
Greetings! Please inform parameters transaformatora T1. I want to remake it under the power of 220 volts. Power switch is not found. Version of the adapter does not fit, because in addition to the American amp powered devices are a few pieces in the front - and a number of adapters tired. Service manual for my model here Скачать manual Harman Kardon hk870 Service Manual. Most likely, the trans will wind itself, and for this you need to know the options. Like, if I understand correctly, this should limit winding trance T1 and replacing the capacitor C1.
From the manual it is a 120 volt primary only . So an outside transformer from 220 primary to 120 secondary of 5 amps on primary is the easy way to use this amp. This also called a step down transformer no need to change the hk870 as it is just supply it with 120volt ac . Hope this helps.
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Old 11th December 2012, 01:19 PM   #3
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Thank you! This is also a good option. However, I want to know the parameters of the native transformer.
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Old 11th December 2012, 03:04 PM   #4
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Originally Posted by alexkmp3 View Post
Thank you! This is also a good option. However, I want to know the parameters of the native transformer.
Very well which ones ?
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Old 11th December 2012, 04:39 PM   #5
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Interested in power and voltage at the terminals of the windings (blk, brn, org, blu).
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