More details...
Here are more details on the design. Tubes are definitely going to be tricky, because even with the op amp design I have provided, you will have to ensure that the output of the op amps are set to within specifications for the tubes, in voltage and amperage. Also, with the tubes, the heater circuit has to be of the right voltage and amperage.
The whole timing circuit, now done with the op amps, does not share a common ground with the rest of the circuit. This means that in order for the grid to be more negative than the cathode you have to have some means of making the grid voltage relative to the cathode, like the diodes I have going to the -Vcc of the op amps in the last timer design for the tubes:
All of this really makes the tube approach something fit for only those who are pretty experienced at all of this.
Relays should be able to provide a nice proof of concept and do not involve as much expense, the challenge of the heater circuit, the challenge of side effects from cathode biasing, or the challenge of being precise with the voltage and amperage from the timing signal.
Modern relays are also available in high frequencies and can be very durable.
Here are some more pictures to help people get their heads around the concept.
Including one that breaks down the components of the timing circuit.
One that shows the expected waveforms.
And one that shows the intended operation of the device.
Some links that help with understanding the various components are:
The clipper component:
Clipper (electronics) - Wikipedia, the free encyclopedia
The differential lo-pass filter op amp circuit:
Phase Locked Loops
Operational amplifier applications - Wikipedia, the free encyclopedia
Low-pass filter - Wikipedia, the free encyclopedia
The comparators:
Operational amplifier applications - Wikipedia, the free encyclopedia
The inverting integrator:
Operational amplifier applications - Wikipedia, the free encyclopedia
Where the voltage spike in the secondary comes from:
Ignition coil - Wikipedia, the free encyclopedia
Peace!
-David
Here are more details on the design. Tubes are definitely going to be tricky, because even with the op amp design I have provided, you will have to ensure that the output of the op amps are set to within specifications for the tubes, in voltage and amperage. Also, with the tubes, the heater circuit has to be of the right voltage and amperage.
The whole timing circuit, now done with the op amps, does not share a common ground with the rest of the circuit. This means that in order for the grid to be more negative than the cathode you have to have some means of making the grid voltage relative to the cathode, like the diodes I have going to the -Vcc of the op amps in the last timer design for the tubes:
All of this really makes the tube approach something fit for only those who are pretty experienced at all of this.
Relays should be able to provide a nice proof of concept and do not involve as much expense, the challenge of the heater circuit, the challenge of side effects from cathode biasing, or the challenge of being precise with the voltage and amperage from the timing signal.
Modern relays are also available in high frequencies and can be very durable.
Here are some more pictures to help people get their heads around the concept.
Including one that breaks down the components of the timing circuit.
One that shows the expected waveforms.
And one that shows the intended operation of the device.
Some links that help with understanding the various components are:
The clipper component:
Clipper (electronics) - Wikipedia, the free encyclopedia
The differential lo-pass filter op amp circuit:
Phase Locked Loops
Operational amplifier applications - Wikipedia, the free encyclopedia
Low-pass filter - Wikipedia, the free encyclopedia
The comparators:
Operational amplifier applications - Wikipedia, the free encyclopedia
The inverting integrator:
Operational amplifier applications - Wikipedia, the free encyclopedia
Where the voltage spike in the secondary comes from:
Ignition coil - Wikipedia, the free encyclopedia
Peace!
-David
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