• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

"Radical" twist on an all DHT phonostage

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#21
Kevin,
I agree. I wanted to give the amp the capability to handle both kinds of cartridges, but since I'll only be using one (primarily MC) i'll use a jumper or something internally to switch them. I'll still be using relays for switching the impedance of the input.

I did read something interesting about latching relays. Does this mean I can use a momentarily closed switch on the coil to switch between the positions (using a DPDT relay?) so there will be no current flow in the relay except for when the positions are switched? Am I understanding this correctly?

Joe
 
#22
Binaural said:
Kevin,
<snip>

I did read something interesting about latching relays. Does this mean I can use a momentarily closed switch on the coil to switch between the positions (using a DPDT relay?) so there will be no current flow in the relay except for when the positions are switched? Am I understanding this correctly?

Joe
Click to expand...

Yes, exactly.. Note that latching relays have their own setting of mechanical issues, and many are not suitable for use in very low signal level circuits - so choose carefully.
 
#23
Kevin, sorry to be a pain but could you elaborate a bit more about the drawbacks of latching relays? You seem to know you're stuff when it comes to this subject, and I appreciate anything you're willing to throw my way. Thanks again for your help Kevin.

Joe
 
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