HD series have FETs at the input and no dc servo, just pot for adjust offset but it's DC amplifiers (DC-300kHz, THD 0,002%, 200V/us...)
Regards
Uh...my plan to build next Sr200 seems to be cancelled .... I ordered pcbs already
I am standing in line waiting for that project...
A soon as the bias regulaste. (ma)
Could i please have the schematic & PCB .pdf file.
studio reference
Use pcb by Alex mm, follow post.
And this schematic will be ok.
..... here it's the files you wish to have.....
Regards ,
Alex
Use pcb by Alex mm, follow post.
And this schematic will be ok.
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If you have technical evidence that the transistors works well with Vce=0.6V then go ahead.In schematic, V reference of Vas's cascoded by ~ 1.2V (1N4148 x 2).
Q5 (Q6) have 0.6V Vce for 5mA Iq (per side)? It's ok?!
How to choose voltage cascode reference? I usually see about 4 ~ 5V in many schematic.
Personally I would go for 2Vce to 10Vce as a guess at what might allow the transistor to perform well.
http://www.essex.ac.uk/csee/research/audio_lab/malcolmspubdocs/J10%20Enhanced%20cascode.pdf
In figure 9. Hawksford seems to use a single Green LED for Bias Voltage.
Regards
In figure 9. Hawksford seems to use a single Green LED for Bias Voltage.
Regards
In schematic, V reference of Vas's cascoded by ~ 1.2V (1N4148 x 2).
Q5 (Q6) have 0.6V Vce for 5mA Iq (per side)? It's ok?!
How to choose voltage cascode reference? I usually see about 4 ~ 5V in many schematic.
Amplifiers with separate PSU for VAS with about 10V higher rail voltage than output stage can use 4~5V cascode reference voltage but with common PSU clip level will be lower.
Hi Joeyt, no you can'tcan i use 63v with these capacitors, 470pf,220nf,100pf and 22nf?
470pF & 220nF will fine but 100pF & 22nF at least 160v. I use 100pF/500v & 22nF/250v
Hi Usman,i cant seem to find MAC224 what else can i use? please, help me.
try to find BT139 ar any TRIAC rated 16A or more
could you explain why?........but 100pF & 22nF at least 160v.........
because I measure voltage across it...could you explain why?
if the rail is +/-75VDC (max as Apex suggestion) then on this cap will be almost 150VDC
also the parallel 10k resistor will be hot, use at least 2w.
Hi AndrewT, where have you been
I'm not so much understand how it's circuit work/operate
but I've build it... (3 x SR200 monoblock)
May you explain better?
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