Hi,
Got the schematic finished as some capacitors couldn´t be measured inbetween the circuits.
With the mastech switching to 0.1Vrms I could identify C1/C9 for a value of 1.2nF - Together with the resistors a 555 calculator pokes nearly 21Khz out - Seems to be right (22Khz measured).
The other caps I could only identify when I´m back to work, as I got there an SMD soldering tweezer.
The resistors I could clearly identify by using an
Resistor Code Calculator.
The resistors are in 0805 size so the typical code marking won´t fit on the surface ( 10K0 = 01C).
Nevertheless, for such a simple design the price is way too high for it, even when the multilayer pcb will of course cost more then a doublelayer.
Reminds of their logic analyzer cable....
Martin