On Fri, May 16, 2025 at 05:15 PM, Andy I wrote:
I don't know what a testofon (or testafon) is
It's a very great measuring device. It converts a resistance to a frequency. R10 is a simulates resistance between the test tips. R7 is the speaker.
With a testofon you can measure on a simple and quick way if a component is damaged (for example a transistor, diode, resistor, switching contacts, etc.). You can mesure under voltage, too. D1, R1 and D2 protects the testofon from damage due to external voltage.
?
Add "startup" to the .TRAN directive.
?
Thanks, that's the solution.
--
Klaus
