ABANDONED

[Jose]

Some time ago I was testing this method of blocking diodes with some modifications, and I noticed that it was sensitive to changes in temperature, and also did not obtain the same performance as the traditional method.
Another drawback was that there was a DC level that made it impossible to adjust to zero volts at the end of the preamp, so I left it.
Last night I was playing with the simulations, I took the one published by Teleno, and I incorporated the switch that Carl published, the result looks good, although they are my first steps with the simulators. I have to try in real life.

[Carl-NC]

The diodes (or diode & BJT) oppose each other so their TCs cancel first-order. Two like diodes will cancel better than a diode and BJT but it should be manageable by tweaking the current densities. Even with using just diodes you want to get the currents to match for best TC cancellation. One of the advantages of the diode+BJT is better control over the currents.

[Altra]

Thank you for the replies.

I've been using a variation of Moodz auto blocker with good results. Making some modifications will post when tested,

[Op04]

del

[Op04]

del