In this post, I would like to discuss a type of power amplifier called class AB amplifiers, specifically the SOCL amplifiers. Let's take a look at the circuit diagram of this amplifier:
The amplifier driver circuit shown above is based on the SOCL 504 Power Amplifier design. However, it only incorporates the amplifier driver circuit and does not include the final amplifier circuit or final amplifier transistor. The driver component consists of SMD components, while some components, such as Elco Capacitors C7, C8, C4, trimpot DCO Set R4, and transistors Q3/Q4, still utilize through-hole components.
The voltage value of Elco C7 and C8 capacitors can be modified to match the power supply voltage. For instance, when using a 45VDC CT voltage, a 50V capacitor can be utilized. Additionally, the amplifier driver can be powered with a maximum of 90VDC CT or 180VDC +- asymmetrical power supply.
There are two options available for Q3/Q4. If you prefer using SMD components, you can go for MMBT5551. However, if you don't want to use SMD components, you can replace them with MJE350/2SC3503.
To install the last transistor, you have two options. You can either mount it directly onto the PCB or simply clip it on. For the NPN transistor base, use the B+ label and connect it with a 4.7 1/4W or 1W resistor series. Similarly, for the PNP transistor base, use the B- label on the PCB. As for the Final Tr Emitter, connect it in series with a 0.22R 5W resistor and attach it to pin E or SP+ on the PCB. The GSP is used for output to GND or SPK- speakers.
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