OMG that's what I couldn't find anywhere!
Could I possibly ask from whence it came?
Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones...
About the ZX80 / ZX81
I think the issue one diagram isn't difficult to find, I saw a version drawn with a CAD program searching this forum but again, without any of the component identifiers.
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Ref Value/Number Notes R1 100Ω ¼W 5% Carbon film R2 2.2Ω ¼W 5% Carbon film R3 2.2Ω ¼W 5% Carbon film C1 to C10 47nF axial Marked 473, 100nF can be used as well C11 22µF 16V C12 22µF 16V C13 100µF 16V C14 1µF 63V A multilayer ceramic type can be used, voltage 50V C15 1µF 63V A multilayer ceramic type can be used, voltage 50V D1 BA157 D2 1N4002 Or 1N4003 to 1N4007 D3 1N4148 D4 BZY88C12 Zener, any 500mW 12V should be okay D5 1N4002 Or 1N4003 to 1N4007 D6 1N4148 D7 1N4148 D8 BZY88C5V1 Zener, any 500mW 5.1V should be okay TR1 ZTX750 Use a ZTX751 or ZXT753 as a replacement
That’s provided ready for when the forum software will correctly process tables.