Tír Na HiFi

Output relays went in today and seems to work very well. As it sits right now, there's a delay of about 15s at turn off and the little turn off pop that was there is take care of.


Voltmeters next.

i could not detect sq loss with early speaker relay prototypes
are we still good?

We are still good. No SQ loss that I can detect.

I noticed the relays do get slightly warm - they are probably the warmest thing in the whole amp - and even at that they are probably only 35degC. That was after it had been on for hours and hours yesterday.

Voltmeters next.

Fran wrote: ↑Sun Jun 18, 2017 4:13 pm We are still good. No SQ loss that I can detect.

I noticed the relays do get slightly warm - they are probably the warmest thing in the whole amp - and even at that they are probably only 35degC. That was after it had been on for hours and hours yesterday.

Voltmeters next.

The heat is due to the voltage/current needed to turn them on & keep them on - I presume they are non-latching relays
One way of overcoming this would be to use latching relays but would need to figure out a way of turning relay off - reversing voltage polarity to control pins

they're simple non-latching relays John - yes, its just the coil current I think. I don't think its worth the redesign it would take to change to non-latching. Ah its hardly a problem - just pointing it out for others when they go at it themselves.

We can try changing the relay signal resistor for a higher value

Voltmeters went in tonight - switched them on the positive so they're off at the flick of a switch. Powered off a mid point around 14V (although there was no difference in brightness from 4V up. Simple little double pole toggle switch needed.

what no video?
Ah...

Gwan so

Great job Fran....excitement is mounting!!