Hello,
Finished up an amp module of Randy Slones' Optimos design.
From what I am told, calculating Vbias is as attaining a quiescent current of 40mA.
I am using the Double Die Semelab devices and .5ohm RE or RMOS resistors. The calculation of Vq is as (40m) (.5+.5), or 40mV. Is this correct??
I ask because I am getting some distortion during medium volume playback. I would guess maybe at about the 100watt range, I get distortion when a sound like a heavy bass guitar or tom tom sound is played back. It is an awkward distortion to me because it appears to be coming out well before the module reaches it's power clip, and, the distortion seems to favor the midbass frequencies. The amp and power supply are capable of 220w at 8 and 300+w at 4 ohm. I am using ON and Fairchild semiconductors, 1% resistors etc...
I suppose the distortion could be a result of some other anomaly aside of Vbias adjustment, however, this is a good spot to start the questions.
Suggestions??
THX
Scott
Finished up an amp module of Randy Slones' Optimos design.
From what I am told, calculating Vbias is as attaining a quiescent current of 40mA.
I am using the Double Die Semelab devices and .5ohm RE or RMOS resistors. The calculation of Vq is as (40m) (.5+.5), or 40mV. Is this correct??
I ask because I am getting some distortion during medium volume playback. I would guess maybe at about the 100watt range, I get distortion when a sound like a heavy bass guitar or tom tom sound is played back. It is an awkward distortion to me because it appears to be coming out well before the module reaches it's power clip, and, the distortion seems to favor the midbass frequencies. The amp and power supply are capable of 220w at 8 and 300+w at 4 ohm. I am using ON and Fairchild semiconductors, 1% resistors etc...
I suppose the distortion could be a result of some other anomaly aside of Vbias adjustment, however, this is a good spot to start the questions.
Suggestions??
THX
Scott