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Thread: How to increase the power output of a 300 watt broadcast amplifier ?

  1. #1
    Associate Engineer
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    How to increase the power output of a 300 watt broadcast amplifier ?

    The image below is the schematic for the design of a 300 watt broadcast amplifier.

    rf-amplifier-300w-fm-88-108-mhz-sch.gif


    This amplifier uses two tp9383 transistors. The individual output power of each individual transistor is 150 watts. A link to the specification sheet of this transistor is provided below:

    tp9383-15678.pdf

    As you can see from the schematic, there is a simple pattern of repeating the same basic circuit with another of the same transistor to double the output wattage, then combining their individual output power wattages together in the final stage, resulting in a doubling of the output power.

    Hypothetically, if a person were to continue this pattern six more times for a total of eight transistors, would they get an output wattage of approximately 1.2Kw ?

    If yes, can this be done indefinetely, or rather, what is the limit ?

  2. #2
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    Talking

    The schematic demonstrates that the two enhancers on the gathering are driven 180 degrees out of stage. Note from the physical format that the two circuits are cautiously coordinated (length of transmission lines) with the goal that the two yields will 180 degrees out of stage and are then used to push/pull drive the yield transmission line.


    It appears that you could join 2, 3, or 4 congregations together, which would require ensuring the data sources were in stage and the speakers were altogether coordinated to one another in gain and deferral with the goal that the yields would likewise be in stage.


    Along these lines, in principle, I trust it very well may be done however with watchful thoughtfulness regarding RF circuit plan format standards. The more enhancers that are paralleled, the lower the yield impedance of the mix. For ideal power exchange, the yield impedance of the get together of speakers should coordinate the impedance investigating the heap which will likely require a type of coordinating system.

  3. #3
    Associate Engineer
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    Apr 2019
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    Hi...you can take the output of two complete amplifiers and combine them (again in anti-phase) to boost the power - this is a common method to build high-output power stages but requires very capable design of the output transformer (combiner) to minimise losses. The combiner is a 'passive' device but requires critical design to work.
    Last edited by peterjohn48115; 04-06-2019 at 07:58 AM. Reason: Typed something wrong

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