Hi,
I was thinking of a design for the MoFo that that could operate from the Mofo power supply itself. The only problem is the pre amp swing needs to twice that of the MoFo to fully run it. I was looking at using an inductor based as well, similar to the LÁmp Inducted but with negative feedback utilising a IRF610. I was planning on biasing it at about 100mA. The inductor can withstand up 150mA.
Just wanted your opinion on if it would work.
Circuit is as attached.
I was thinking of a design for the MoFo that that could operate from the Mofo power supply itself. The only problem is the pre amp swing needs to twice that of the MoFo to fully run it. I was looking at using an inductor based as well, similar to the LÁmp Inducted but with negative feedback utilising a IRF610. I was planning on biasing it at about 100mA. The inductor can withstand up 150mA.
Just wanted your opinion on if it would work.
Circuit is as attached.
Attachments
22mH at 50Hz is 7 Ohms. If this stage will drive that, it would drive the speaker direct.
I think you want more than "several" henries, so working above 1K impedance. Essentially a small SE tube output transformer winding, or a selected iron-core choke.
Without values, we can't judge if there is significant NFB to reduce MOSFET "plate resistance" and ease the demand on the choke.
Since the MOFO is a follower, bootstrapping is possible. You never get full 2X supply, but you can get well past the top rail. (Ah, but all capacitors suck.)
I think you want more than "several" henries, so working above 1K impedance. Essentially a small SE tube output transformer winding, or a selected iron-core choke.
Without values, we can't judge if there is significant NFB to reduce MOSFET "plate resistance" and ease the demand on the choke.
Since the MOFO is a follower, bootstrapping is possible. You never get full 2X supply, but you can get well past the top rail. (Ah, but all capacitors suck.)
Actually this is where it gets interesting. The inductor will have 2 potential equivalent model. In a pure AC mode (with no DC). I think it is correct to model as such, but in a DC mode, the inductor is a constant current source. So which one would be a closer model. Maybe model it as a current source in series with the inductor? In which case impedance of a current source is infinite...
Oon
Oon