lcp12345
100+ Head-Fier
- Joined
- Dec 5, 2005
- Posts
- 106
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I have built a M3 headphone amp. It is function for a over 2 months. Since ground noise was found in this amp with no signal feed. I have checked where is come from. But, the amp got problem after I had heard a "spark" sound during check.
The following observation were found,
1.The problem is Vop+/Vop- and V+/V- is normal (it was +/-13.8V) without all OPAMP insert.
2. OPAMP voltage wound drop half(around +/-7.4V) if OPAMP was insert to any channel.
3.V+ is +20.8V and V- is-7.2 in situation 2
4. OPAMP Voltage supply was further dropped to around +/-3.1V when all opamp was inserted. I have no idea about this though I have replaced Q5+ Q5-, Q6+, and Q6-. The TLE2426 is swapped as well. But, this doesn't help. I have a look on the components. It seems no problem without any scratch.
5. The V+is24.6V, V- is -3.6V in situation 4.
Any idea?
The following observation were found,
1.The problem is Vop+/Vop- and V+/V- is normal (it was +/-13.8V) without all OPAMP insert.
2. OPAMP voltage wound drop half(around +/-7.4V) if OPAMP was insert to any channel.
3.V+ is +20.8V and V- is-7.2 in situation 2
4. OPAMP Voltage supply was further dropped to around +/-3.1V when all opamp was inserted. I have no idea about this though I have replaced Q5+ Q5-, Q6+, and Q6-. The TLE2426 is swapped as well. But, this doesn't help. I have a look on the components. It seems no problem without any scratch.
5. The V+is24.6V, V- is -3.6V in situation 4.
Any idea?
