|
audioguru
Nobel Prize Winner
Canada
4218 Posts |
 Posted - Oct 29 2015 : 10:47:42 PM
|
The circuit has been designed to use a 10V-0-10V transformer because the transistors and opamps have a 2V loss.
Your transformer is much too small and maybe your battery is much too weak.
Hundreds of this circuit are used in The Philippines with no problems except the output is a squarewave and many electronic products do not work since they rely on the higher peak voltage of a sinewave from normal electricity. Maybe your voltmeter cannot accurately measure a squarewave? My voltmeter accurately measures "true RMS".
Measure your battery voltage while you connect the 10W load. A 13.8V battery might normally drop to 13.7V, yours might drop to 7V. It is a very simple circuit without voltage regulation so the output voltage will normally drop a little when loaded. |
 |
|
doubt
200863223037_500W inverter smalll pic.PNG