At your own risk.
(Μπορεί να τον χρησιμοποιήσουν οι γάτες και η υπομονετική χελώνα στο Echo room και να ηχογραφήσουν με ενα micro cassette recorder με εξωτερικό μικρόφωνο και Pleiades preamplifier, may be used for a echo chamber send).
The Pleiades power amplifier is an amplifier in pure class A operation (electrons flowing at all time) that uses only 2 components.
A power transistor, a basing resistor and the speaker itself as a load resistor.
Input is to base (a coupling capacitor may not be needed if the source has one at the output).
Bias is by a resistor from collector to base determined experimentally.
The emitter is connected to ground.
One side of battery (+) (trough fuse of course) is connected to the full range speaker and the other terminal of the speaker is connected to collector, battery (-) to ground.
Enjoy the fantastic and purest sound.
Of course many full range speakers for example 4 on each channel can be connected (series parallel combination if you want to get back to 8Ω). Many speakers behave as a large speaker for amazing bass but the treble is still there. If the cabinet is open back or a flat panel,is used the bass reduction slope is very gentle, only 6dB per octave giving amazing bass. This is the Pleiades speaker. Each speaker may be powered individually by a Pleiades power amplifier therefore having unlimited power in pure class A. This is the Pleiades active speaker.
It works with a 2N3055.
Best not to increase beyond 6-12 V are there is danger of thermal runway that might blow the speaker. So a fuse may be useful in series with the speaker too.
It sounds for some reason (low mobility of electrons in Germanium?) better on Germanium transistors. The battery polarity has to be reversed.
It is great with Darlington transistors with a much larger biasing resistor for overdrive and electro guitar applications. Or connected to a synthesizer for amazing distortion. The resistor can be adjusted for cutoff when there is no signal to create a very effective noise gate. And when you press a synth key you have to most dynamic sound ever heard.
References:
Audio Amplifiers- J.R.Davies -Data Publications -1968 first printing -p.41 - 2 transistor miniature A.F. Amplifier
Transistor Audio Amplifier Manual - Clive Sinclair (ZX spectrum fame) - Bernards's Radio Manuals
(Μπορεί να τον χρησιμοποιήσουν οι γάτες και η υπομονετική χελώνα στο Echo room και να ηχογραφήσουν με ενα micro cassette recorder με εξωτερικό μικρόφωνο και Pleiades preamplifier, may be used for a echo chamber send).
The Pleiades power amplifier is an amplifier in pure class A operation (electrons flowing at all time) that uses only 2 components.
A power transistor, a basing resistor and the speaker itself as a load resistor.
Input is to base (a coupling capacitor may not be needed if the source has one at the output).
Bias is by a resistor from collector to base determined experimentally.
The emitter is connected to ground.
One side of battery (+) (trough fuse of course) is connected to the full range speaker and the other terminal of the speaker is connected to collector, battery (-) to ground.
Enjoy the fantastic and purest sound.
Of course many full range speakers for example 4 on each channel can be connected (series parallel combination if you want to get back to 8Ω). Many speakers behave as a large speaker for amazing bass but the treble is still there. If the cabinet is open back or a flat panel,is used the bass reduction slope is very gentle, only 6dB per octave giving amazing bass. This is the Pleiades speaker. Each speaker may be powered individually by a Pleiades power amplifier therefore having unlimited power in pure class A. This is the Pleiades active speaker.
It works with a 2N3055.
Best not to increase beyond 6-12 V are there is danger of thermal runway that might blow the speaker. So a fuse may be useful in series with the speaker too.
It sounds for some reason (low mobility of electrons in Germanium?) better on Germanium transistors. The battery polarity has to be reversed.
It is great with Darlington transistors with a much larger biasing resistor for overdrive and electro guitar applications. Or connected to a synthesizer for amazing distortion. The resistor can be adjusted for cutoff when there is no signal to create a very effective noise gate. And when you press a synth key you have to most dynamic sound ever heard.
References:
Audio Amplifiers- J.R.Davies -Data Publications -1968 first printing -p.41 - 2 transistor miniature A.F. Amplifier
Transistor Audio Amplifier Manual - Clive Sinclair (ZX spectrum fame) - Bernards's Radio Manuals
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