EMINENT E310 RACK VERSION
donderdag 30 juni 2011
dinsdag 28 juni 2011
A few more tests
The last week I have done several test acording temperature stability of the master oscillators. It seems that there is a little frequency shift. In the design I will introduce NTC resistors to keep the frequency in track.
More of this later.
More of this later.
vrijdag 17 juni 2011
A picture of the oscillator circuit
The trigger circuit
OK, how will we trigger these waves ?
I tried several circuits and came up with a very compact solution.
A MOSFET transistor serves as trigger and envelope gate.
This handy MOSFET has 2 gates ; 1 gate will amplify the sawtooth and the other gate will be used to control the envelope of the sound.
A simple RC circuit controls the ATTACK and RELEASE time.
I will add the schematics later for a better understanding
I tried several circuits and came up with a very compact solution.
A MOSFET transistor serves as trigger and envelope gate.
This handy MOSFET has 2 gates ; 1 gate will amplify the sawtooth and the other gate will be used to control the envelope of the sound.
A simple RC circuit controls the ATTACK and RELEASE time.
I will add the schematics later for a better understanding
The dividers and sustain gates
The master oscillators produce square waves. These square waves are used to trigger the divider gates. The same circuit of the original E310 produce exact the same sawtooth waveform, only mirrored. The mixer in the final stage will reverse these sawtooth to the original shape.
The big difference in this new circuit is the positive power supply.
In this case PNP transistors BC557B will be used.
I have monitored these sawtooth waves and compared them with the original.
No differences here !
The sustain gates are like the original ones, only with PNP transistors.
Cheap BC557B transistors are very suitable for the dividers and sustain gates.
The big difference in this new circuit is the positive power supply.
In this case PNP transistors BC557B will be used.
I have monitored these sawtooth waves and compared them with the original.
No differences here !
The sustain gates are like the original ones, only with PNP transistors.
Cheap BC557B transistors are very suitable for the dividers and sustain gates.
The master oscillator
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