what is spec of this design
is it tested ?
RMS 8/4/2 Ohm
Max Rail ?
minimum rail to start work ....30 40,50 V +/-
regards
is it tested ?
RMS 8/4/2 Ohm
Max Rail ?
minimum rail to start work ....30 40,50 V +/-
regards
Maximum voltage on transistors can be 140+18=158V in non conduction rail side on other side emiter to colector voltage is 18V maximum.
Tracking Downconverter | Sunfire
ok thx for info
The basic amp schematic is popular class AB apexaudio 900 W class H PA amp,
1. but whats specification (output power( have this amp with TD Step ?
2. Is it possibile to add TD Step to any other class AB Amp ?
Finally: 900 W class H PA amp have 2 different high voltage Rails,
TD have 1 high voltage Rail 140V, + 18V standby
If I missunderstood something wrong, pleaae help to understand
The basic amp schematic is popular class AB apexaudio 900 W class H PA amp,
1. but whats specification (output power( have this amp with TD Step ?
2. Is it possibile to add TD Step to any other class AB Amp ?
Finally: 900 W class H PA amp have 2 different high voltage Rails,
TD have 1 high voltage Rail 140V, + 18V standby
If I missunderstood something wrong, pleaae help to understand
Last edited:
Basic amp schematic is B500. B500 with class H is H900, with class TD is TD1800 and power will be double with same number of output devices.
This tracking downconverter can work only with B500 topology, for any other amp use Yamaha EEEngine or Sunfire by Carver or LabGrupen...TD converter
Thx for Info
very good.....good news
This means, I can get 1800W @ 4 Ohm
with same number of output devices compare to H900 / B500
4 output devices per Rail = 8
without leave SOA oputput devices, no second breakdown ?
I think this trackinng downconverter can work with BGW 750B/C too
I want try
BGW 750B Bass Amp similar Apex B500
selected costumized 12 x SJxxx Motorola / RCA TO3 output devices very reliable PA Amp design
working 23 years 1978 - 2001 in High End PA Installation Frankfirt Airport Germany Disco Club Dorian Gray
To reduce heat I think can add TD1800 step down converter
replace original VI Limiter with Apex VI Limiter, amp should work stable
selected costumized 12 x SJxxx Motorola / RCA TO3 output devices very reliable PA Amp design
working 23 years 1978 - 2001 in High End PA Installation Frankfirt Airport Germany Disco Club Dorian Gray
To reduce heat I think can add TD1800 step down converter
replace original VI Limiter with Apex VI Limiter, amp should work stable
Attachments
BGW 750B Bass Amp is not similar Apex B500. B500 is CFA amplifier use OP amp as DC servo, BGW is VFA amp use OP amp for gain and NF fedback....
Thx for Info
to learn and understand
If I design new BGW 750B PCB with small changes ( VI limter )
and add TD1800 step down converter,
can BGW 750B work ?
In this case compare to 500W before, now can get 1800 W
I remember some diy people add class H Stepdriver to old BGW, it works and heat decrease.
one more question
Mosfet IRFP 250B in TD1800 is
200V Single N-Channel HEXFET Power MOSFET in a TO-247AC package
we have 140V
is it safe using 200V Mosfet with 140 V rail ?
Mosfet IRFP 250B in TD1800 is
200V Single N-Channel HEXFET Power MOSFET in a TO-247AC package
we have 140V
is it safe using 200V Mosfet with 140 V rail ?
Can this schematic protection be used for TD1800? and if possible, is the PRO symbol in the protection connected to the PRO symbol in the TD1800 schematic? Thx
Yes this protect is compatible with PRO detect on TD1800.
Attachments
This is one of the project that has "stolen" my Dreams but someday I will build it. I will begin finding out the price for dome parts.