yes is this made in practice by you? many sent me messages that there is some oscillation etc.
Have you built this circuit?
apex ba2000
Hi dear Apex Sir,
Please reply to us, I also tried this amp but finally end with lot of oscillation . From the speaker line some heart beat sound comes even theres no signal input also. Could you please reply to us what to do.
I think Original amp Proline 3000 might use different values of resistors and pf caps. if anyone have the Proline 3000 amp also please help us to build this amp.
I saw on the driver stage of original amp , for the two 15v zeners there are two resistors comes parallel. but it is not there on the Proline schematic as well as Apex ba2000 schematic.
Apex Sir. we found Proline 3000 schematic later. but we saw ba2000 schematic and believed you and spend lot of time and money to build this amp. So please help us to finish this amp successfully. don't abandon us Sir
Hi dear Apex Sir,
Please reply to us, I also tried this amp but finally end with lot of oscillation . From the speaker line some heart beat sound comes even theres no signal input also. Could you please reply to us what to do.
I think Original amp Proline 3000 might use different values of resistors and pf caps. if anyone have the Proline 3000 amp also please help us to build this amp.
I saw on the driver stage of original amp , for the two 15v zeners there are two resistors comes parallel. but it is not there on the Proline schematic as well as Apex ba2000 schematic.
Apex Sir. we found Proline 3000 schematic later. but we saw ba2000 schematic and believed you and spend lot of time and money to build this amp. So please help us to finish this amp successfully. don't abandon us Sir
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First of all isolate your output stage and then debug your IPS and VAS using dummy load at the output of the VAS. You might blow up your speakers at extreme high power by this amp or in the worst case the OPS.
The circuit is actually simulating well. Probably the pcb routing might be the problem.
try different compensation methods.
Once done give little voltages to the ops like 20V for the LV and 40V for HV see if the oscillation is stopped and then slowly increase the voltage.
I doubt about your Zobel also so check once if the values are right and its properly soldered.
The circuit is actually simulating well. Probably the pcb routing might be the problem.
try different compensation methods.
Once done give little voltages to the ops like 20V for the LV and 40V for HV see if the oscillation is stopped and then slowly increase the voltage.
I doubt about your Zobel also so check once if the values are right and its properly soldered.
hi guys, am having problems with ba1200 input balance, despite having made sure I've done it completely correct, rechecked and rechecked, but no sound, only tiny crackling sound but the amp is very ok. I used the Rev 1.4 layout could be the problem.
I am planning to build BA1200. It has less components & easy to build but hard to find MJL4281A & MJL4302A here. Can I replace MJL4281A & MJL4302A with any other? Please help me. Thanks.
Theoretically works, howevers in pratice not really. Big, and heavy to move...
Sajti
The ones built don't seem to look that much bigger than the crown amps I used to work with many years ago when I used to do audio production work, and they were hefty,
If I build, i would likely have them racked in a trolly setup that can be easy deployed into the field.
The only question I have is the inputs on this look like there unbalanced and pro audio uses balanced audio. I have a schematic of a crown amp I have at home has the input stage with circuit that converts the balanced signal to unbalanced before feeding to the input to the amplifier
I am finding it hard to find a transformer that will drive something like this. where do you get them from?
This was the best I could find locally.
92450-P2S2 | 2 Output Toroidal Transformer, 1kVA, 2 x 55V ac | Nuvotem Talema
is there anyway I can make this voltage work?
alternatively, does anyone know how to build a switchmode power supply that is capable of this kind of output?
I have managed to make the ba1200 and the sound is sound is so nice, but when its playing its always protecting what could be the problem im thinking it could be biasing coz I just get it stable. if there is anyone who can help me with the proper procedure of biasing this amp, heeeelp pliz.
Esta excelente este amplificador lo voy a empezar a construir es el mejor diseño que e visto hasta ahora gracias por compartirnos el diseño
robinjavi: This is an English speaking forum. If you wish to post in another language, post a translation also. Thank you.
Google Translate:
This excellent amplifier I'm going to start building is the best design that I've seen so far thanks for sharing the design
robinjavi: This is an English speaking forum. If you wish to post in another language, post a translation also. Thank you.Google Translate:
This excellent amplifier I'm going to start building is the best design that I've seen so far thanks for sharing the design
Is possible use this amplifier with esl loudspeakers that go down to 0,5 ohm of impedence ?Perhaps with less power suppli and more power transistor?I am getting crazy to find a good schematic of a esl ampli.Tanks a lot.
Regards
Regards
connection from the secondarie transformer
hello guys
I want to copy the Apex BA1200 power supply with Sprint Layout 6 software I have one question is this is the right way to connect the secondaries from the power transformer ? AC red is one winding and AC blue is the other winding from the secondaries of the power transformer
hello guys
I want to copy the Apex BA1200 power supply with Sprint Layout 6 software I have one question is this is the right way to connect the secondaries from the power transformer ? AC red is one winding and AC blue is the other winding from the secondaries of the power transformer
Attachments
apex1200 watts power amp.
hi''''iam new in the groups,,,,can i ask question?how much price kit of apex1200watts?this power kit is tested?i want to build a mobile sound system in the philippines''''
thank you
sarskie
hi''''iam new in the groups,,,,can i ask question?how much price kit of apex1200watts?this power kit is tested?i want to build a mobile sound system in the philippines''''
thank you
sarskie
Have you checked the maximum voltage applied to your capacitors in your proposal?
65Vac might give a lot more than 100Vdc in worst case operation.
