Does anybody know what ferrite grade is used on the fet driver transformer. I have had one burn out and have rebuilt it but would like to redesign it with better isolation between windings. Have trie
Does anybody know what ferrite grade is used on the fet driver transformer. I have had one burn out and have rebuilt it but would like to redesign it with better isolation between windings. Have tri
Thanks for the reply the transformer failed because of a small cut in the rubber sleeving where it entered the ferrite. As the ferrite is earthed the insulation on the litz was not good enough. I hav
--Original Message-- From: Andy Talbot <[email protected]> To: rsgb_lf_group <[email protected]> Sent: Fri, 8 Jan 2016 18:53 Subject: Re: LF: Decca 5501 The fact it is a GAPPED core is
Andy thanks for that I am looking to find a scrap amplifier module to play around with with a view to rebuild the PCB and drive circuits. Looking on a scope the switching is very symmetrical but that
--Original Message-- From: Andy Talbot <[email protected]> To: rsgb_lf_group <[email protected]> Sent: Wed, 13 Jan 2016 9:51 Subject: Re: LF: Decca 5501 Bit late now, but I found the c
OK thanks Andy I do have the circuit diagrams but I understood that the clamp only operated if the drive was lost. The description was not that clear to me but a probe with the scope may clear that u
Yes, D7 will charge C8 when drive is present, and the time constant of C8, R15, R16 and RV3 is about a millisecond, so IC1b is most likely a drive supervisor. The 29T winding together with D11 clamps
I am Fausto IK4NMF, I am interested to a DECCA 5501 amplifier. Does anyone know if any unit is available on the market surplus in uk. I have search on the web without success. Thanks in advance Faust
I have recently modified a Decca 5501 unit for 500 Kcs and it is performing well. A soak test to a 50 ohm DL shows good stability. An individual unit will produce a conservative 400w o/put. It requir
MF Now that MF is shaping up with DL permits and others. If you can find a DECCA sub unit 5501 it takes less than a couple of hours to modify/ adapt for the 472 Khz band. In round figure values all t
