2 pcs. Audio amplifier JLH 1969 Class A with Toshiba 2SC5200

Features

• Using the high-precision Toshiba 2SC5200 high-current voltage regulator, the output voltage is very stable
• Input with thin film audio capacitor - for better sound
• Toshiba 5200 output - This amplifier has a maximum power of up to 150 W, allowing the 1969 to output a maximum of 25 W Class A

Specifications:

• Power: 50W or more (AC18V 120W transformer is recommended)
• Voltage range: AC12V - AC28V
• Supply voltage: 5 - 12 V

Debugging method:
Commissioning is divided into static current test and neutral voltage test.

1. Quiescent current has been adapted to the house, standard 1.2 A. You can change the quiescent current by adjusting the 202 resistor on the board, 1-2 A is recommended. In addition, the quiescent current must be tested in series with the current input port.
2. Midpoint voltage test: The midpoint voltage must be half of the power supply voltage, that is, the power supply is 18 V, then the midpoint voltage should be 9 V. The test uses the DC voltage file, the red test pin is connected to the positive terminal of the output capacitor and the black test lead is grounded. Adjust the resistor 204 so that the voltage is equal to half of the power supply voltage.

Scope of delivery

• 2 x JLH 1969 class audio amplifier with Toshiba 5200