Search found 447 matches

by gozzo
Sat Feb 03, 2018 3:50 pm
Forum: Hardware
Topic: UK700 PSU running at 18.1 volts
Replies: 14
Views: 638

Re: UK700 PSU running at 18.1 volts

or double up on the bridge diodes, use 2 in series for each quarter?...
by gozzo
Sat Feb 03, 2018 3:49 pm
Forum: Hardware
Topic: UK700 PSU running at 18.1 volts
Replies: 14
Views: 638

Re: UK700 PSU running at 18.1 volts

you could fit a couple of 1n5401s between the output of the bridge rectifier arrangement and the cap..? that'd drop the output a bit...
by gozzo
Sat Feb 03, 2018 3:40 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 50
Views: 2506

Re: zx spectrum in zx81 case

can anyone supply preprogrammed cplds for this zxmax, as i have bought an empty board, can find the other parts easily,.. i do have 3 'used' cplds but as to whether they can be erased and reused i dont know, plus i dont know what software or programmer device would be needed to program them...
by gozzo
Mon Oct 23, 2017 7:26 pm
Forum: Hardware
Topic: UK700 PSU running at 18.1 volts
Replies: 14
Views: 638

Re: UK700 PSU running at 18.1 volts

and ..what mains voltage is it rated for and what is it running on. if its designed for 220v (but that would normally be a EU700? or something like that?) and being run on 240v , it will be high....maybe has a 220v transformer fitted in a uk/240v case???
by gozzo
Mon Oct 23, 2017 7:24 pm
Forum: Hardware
Topic: UK700 PSU running at 18.1 volts
Replies: 14
Views: 638

Re: UK700 PSU running at 18.1 volts

hmm, may have shorted turns on the primary winding, does it get warm/hot after a while when on no load? if so it could have. also test voltage with a reasonable load...
by gozzo
Fri Oct 13, 2017 4:09 am
Forum: Hardware
Topic: ZX81 rebuild
Replies: 114
Views: 4883

Re: ZX81 rebuild

these will almost certainly be genuine, very good supplier.. http://www.ebay.co.uk/itm/MPS2369A-MOTO ... 0653829622 the type number 'print' is totally different, seems to be 'etched' ...
by gozzo
Fri Oct 13, 2017 4:04 am
Forum: Hardware
Topic: ZX81 rebuild
Replies: 114
Views: 4883

Re: ZX81 rebuild

and i think that supplier above is where i got some mps2369s from..havent tried them yet..something about the type number printing doesnt look quite right, though..... maybe something else relabelled?!!
by gozzo
Fri Oct 13, 2017 4:00 am
Forum: Hardware
Topic: ZX81 rebuild
Replies: 114
Views: 4883

Re: ZX81 rebuild

oh, what were these eeproms that were bad? and from what supplier? i've bought a fair few but not got round to using them yet...
by gozzo
Fri Oct 13, 2017 3:58 am
Forum: Hardware
Topic: What is the going price to have EPROMs burnt?
Replies: 28
Views: 1018

Re: What is the going price to have EPROMs burnt?

are you thinking of offering an eprom burning service, or are you after someone to burn some for you?
by gozzo
Sun Oct 08, 2017 4:46 am
Forum: Hardware
Topic: ZX81 rebuild
Replies: 114
Views: 4883

Re: ZX81 rebuild

oh, and 2N2369 plastic version... MPS2369 ...i have at least one zx81 that has these in...