Search found 50 matches

by Morpheus
Fri Sep 21, 2018 3:23 pm
Forum: Hardware
Topic: Noisy Audio on Taiwanese +2
Replies: 19
Views: 183

Re: Noisy Audio on Taiwanese +2

So, if you use a newer, regulated PSU, does it make a difference noise-wise? Yes noise is improved by using modern power supply compared to the old Sinclair/Amstrad one. I changed some of the ceramic capacitors around the the power in and that helped a little bit as well and also the new 7805 Regul...
by Morpheus
Fri Sep 21, 2018 12:45 pm
Forum: Hardware
Topic: Noisy Audio on Taiwanese +2
Replies: 19
Views: 183

Re: Noisy Audio on Taiwanese +2

What PSU are you using with your +2? I have the original power supply and the noise using that is very bad. I have a new 9V 2A Power Supply and it doesn't look a cheap and nasty one but I could not tell really it's made by someone called Akuru. I normally use Goodleads as the ones they ship have a ...
by Morpheus
Fri Sep 21, 2018 10:14 am
Forum: Hardware
Topic: Noisy Audio on Taiwanese +2
Replies: 19
Views: 183

Re: Noisy Audio on Taiwanese +2

I have been having a go at this +2 this morning. I have replaced some of the decoupling capacitors on the power circuit and fitted a new 7805CV Voltage Regulator and the noise has diminished to the point where I can hear the Beeper sound/music on normal volume levels.... Maybe it was the VR after al...
by Morpheus
Fri Sep 21, 2018 6:28 am
Forum: Hardware
Topic: Noisy Audio on Taiwanese +2
Replies: 19
Views: 183

Re: Noisy Audio on Taiwanese +2

My +2 Grey has always had a loud hum to the sound. I've owned it since the release of 1986. As you stated, it is possible to hear it working as the screen is being drawn in a BASIC listing, the high pitched whine when enter is pressed and changing colours can make it musical. 5 LET A=20 10 BORDER 0...
by Morpheus
Thu Sep 20, 2018 1:02 pm
Forum: Hardware
Topic: Noisy Audio on Taiwanese +2
Replies: 19
Views: 183

Re: Noisy Audio on Taiwanese +2

Hi I have replaced the two resistors as listed and the audio is more equal coming out of the mono socket. The noise is still there though and drowns out any Spectrum audio at normal levels. The audio off the little Module fitted to pins 1,4,5,6 of the AY chip has nice clear audio so it would seem to...
by Morpheus
Wed Sep 19, 2018 5:06 pm
Forum: Hardware
Topic: Noisy Audio on Taiwanese +2
Replies: 19
Views: 183

Re: Noisy Audio on Taiwanese +2

Update:

I disconnected the flylead from Pins 34,35 of the ULA and the noise is gone but so is the Beeper sound now. I need to find a way to filter that signal or tap in somewhere else.
by Morpheus
Wed Sep 19, 2018 4:21 pm
Forum: Hardware
Topic: Noisy Audio on Taiwanese +2
Replies: 19
Views: 183

Re: Noisy Audio on Taiwanese +2

I had an RGB Lead from Retrocomputershack connected for the picture and first some headphones and then the powered mini PC speakers in the 3.5 Stereo Jack of the Internal mod. I have it connected to pins 1,4,5,6 ( A,B,C & Gnd ) and the flylead connected to pins 34,35 of the ULA as per the destructio...
by Morpheus
Wed Sep 19, 2018 2:15 pm
Forum: Hardware
Topic: Noisy Audio on Taiwanese +2
Replies: 19
Views: 183

Re: Noisy Audio on Taiwanese +2

Well I disconnected the Tape and there is no Improvement so the problem is on the main PCB some circuit is generating some serious interference on the Audio.
It's almost like you can hear high pitched whine as the Spectrum processes something and then goes back to noise once it is finished.
by Morpheus
Wed Sep 19, 2018 1:48 pm
Forum: Hardware
Topic: Noisy Audio on Taiwanese +2
Replies: 19
Views: 183

Noisy Audio on Taiwanese +2

Hi I have bought a +2 and I went with the Grey +2 rather than the +2a because I heard about the corrupted audio on +2a's and +3's. I seem to have backed the wrong horse here. The Audio is overridden by a humming noise that drowns everything out it was worse using the old power brick but it improved ...
by Morpheus
Tue Sep 11, 2018 5:22 pm
Forum: Hardware
Topic: +2 ( Grey ) External Cassette input
Replies: 1
Views: 108

+2 ( Grey ) External Cassette input

Hi everyone. I have just obtained a +2 Spectrum ( Grey ) and it was made in Taiwan not the UK. The only info I can find to add an external EAR input onto the cassette is based around the UK Cassette PCB. Can someone give me some insight into fitting one for the Taiwanese model cassette unit please a...