PSU Voltages.
Posted: Fri Aug 10, 2018 8:31 pm
Dear All,
I am putting order in my small Sinclair Collection (1 × ZX80 in kit, 1 × ZX81, 2 × Spectrum, 1 × QL), testing everything.
I was using one of two Spectrum when it simply turned off... I was a bit scared when I decided to measure the voltage from the PSU and it was 0.9V...I breathed a sigh of relief.
After this I decided to measure the voltage of all my 3 PSUs and I found what follows:
° ZX81: 19V
° Spectrum 1: 12.5V
° Spectrum 2: 14.5V (after a while the "dead" PSU decided to get back to life).
Anyway the above voltages are much above the 9V declared...
I started looking over internet and I have found in one site that Spectrum PSUs are normally 15V without load (if this is right, the 12.5V is too weak).
Nothing about the ZX81.
Can you help me understand what is happening?
3 dead PSUs?
Someway to repair them?
Thank you
I am putting order in my small Sinclair Collection (1 × ZX80 in kit, 1 × ZX81, 2 × Spectrum, 1 × QL), testing everything.
I was using one of two Spectrum when it simply turned off... I was a bit scared when I decided to measure the voltage from the PSU and it was 0.9V...I breathed a sigh of relief.
After this I decided to measure the voltage of all my 3 PSUs and I found what follows:
° ZX81: 19V
° Spectrum 1: 12.5V
° Spectrum 2: 14.5V (after a while the "dead" PSU decided to get back to life).
Anyway the above voltages are much above the 9V declared...
I started looking over internet and I have found in one site that Spectrum PSUs are normally 15V without load (if this is right, the 12.5V is too weak).
Nothing about the ZX81.
Can you help me understand what is happening?
3 dead PSUs?
Someway to repair them?
Thank you