Οbjerver εχεις δοκιμασει να ακουσεις τον ενισχυτη σου διχως πυκνωτη στην εισοδο .Εγω δεν πιστευα στα αφτια μου απο την λεπτομερεια ,
αλλα απαιτει προενισχυτη ή μπαφφερ ή αλλη πηγη με μηδενικο offset .Offset προεν X Tην ενισχυση-κερδος ενισχυτη να μην υπερβαινει 0-10mv την εξοδο στον ενισχυτη σου .
Τωρα ειναι δικη σου επιλογη αλλα τα 6,3 καλυτερα να ηταν κατω απο 5mv .O Nikos θα σου δωσει οδηγιες καλυτερες απο μενα.
5. HOW TO KNOW IF THE CIRCUIT IS WORKING PROPERLY
In general, if its not noisy, too hot, or having high DC offset, and the +reg is 3% more on
average for matched leds on both banks and between them, plus side R5 has more mV than
neg side, is good to go.
Salas.
1. See that you have 2V+/-0.3V across R1 combinations. That says the shunts CCS currents
are normal.
2. Check that you hear the output relay clicking one time 3-4 seconds after power on.
3. See that you have less than +/-5mV DC offset on the audio outputs.
4. See that you have +Vout a bit more than - Vout.
If all of the above are OK, connect to stereo. Check for ground loops. If the background is
silent, play some music.
Salas.
DaveM it looks great. 0.5v difference between the sides seems to be normal for this build so
you are in spec with that. I too find my 1st set of FETs run a bit hot I put some small sinks on
them and they seem happy now.
billyk.
Check all LEDs light up when powered (if there is a fault some LEDS will not light up - my
experience in building this)
Once powered check whether there is a click sound after 5-7 seconds delay on powering up.
This indicates relay is working correctly. Measure Voltage across the Diode fitted across relay
coil for knowing the voltage. If not, something to be corrected on switch on delay circuit.
Everybody is getting similar 10.9V and -10.5V range ie one side is about 0.5 V higher than the
other leg - it does not affect buffer offset. Also the Mosfet can be held for 5 seconds without
pulling out - you do not need heatsink for functioning. However placing a heatsink does not do
any harm either. It is good to go -
kannan_s
Measure your DC offset at the output. If under 5mV, leave it as it is. Depending on the B1 jfet
match, some reg assymetry is beneficial, as it offsets the offset. If the output DC is more than
5mV, you can give more voltage by substituting stronger Vf led(s) in the opposite supply. I.e.
If your offset is +5mV you want to make the negative reg Vout stronger. If over -5mV, do the
opposite. I could get it down to absolute zero that way. But guess what, it amounts to
absolutely nothing. Not safer, no better square wave, or any better sound. If you got DC audioout offset in the +/-5mV range, just drink a beer. Forget it.
Salas