Beginning in the early 1960s, ECL circuits were implemented on monolithic integrated circuits and consisted of a differential amplifier input stage to perform logic and followed by an emitter follower stage to drive outputs and shift the output voltages so they will be compatible with the inputs.
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While for decades the Quasi-complimentary output stage made sense, recently PNP and NPN power transistors have become roughly equally available and have more closely matched performance characteristics, and so modern audio power amplifiers often use equivalent topologies for both pairs, either both Darlington emitter follower or both Sziklai pair.
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The base voltage of the right transistor T3 is held fixed by a reference voltage source, shaded light green : the voltage divider with a diode thermal compensation ( R1, R2, D1 and D2 ) and sometimes a buffering emitter follower ( not shown on the picture ); thus the emitter voltages are kept relatively steady.
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In this bipolar junction transistor ( BJT ) implementation ( Figure 4 ) of the general idea above, a " Zener voltage stabilizer " ( R1 and DZ1 ) drives an " emitter follower " ( Q1 ) loaded by a " constant emitter resistor " ( R2 ) sensing the load current.
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If the frequency of your waveform is low ( less than, perhaps ten Hertz ), such a power supply could be used with any number of simple waveform-generation circuits to produce your desired effect . ( See function generator . ) Alternatively, consider an emitter follower connected between an ordinary constant voltage power supply and your load, with the'follower being driven by a waveform generator . ( Also, if your power requirements are small enough, you might find that a function generator itself can output the power directly . ) You can also buy " bipolar power amplifiers " that can help here, but they tend to be pricey.
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