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allgemeine Kategorie => mcHF Projekt Deutsch / English (here you can discuss everything related to mcHF) => Message started by: yi3whr on 20. June 2021, 08:45:04

Title: mcHF LPF switching bug?
Post by: yi3whr on 20. June 2021, 08:45:04

referring to mcHF schematics sheet 4/8 LPF switching circuit ... there is R31-R34 which is a pull up resistors for the output of U14 the resistance of these resister are 27ohm .... that's a 180mA of current through the U14 ... is that ok ?? or I'm missing some thing ?

Title: Re:mcHF LPF switching bug?
Post by: SP3OSJ on 20. June 2021, 11:02:21

27 Ohm will draw more than 180mA, but ok for few mS pulse.

Title: Re:mcHF LPF switching bug?
Post by: yi3whr on 20. June 2021, 11:49:09

ok thank you ... just want to make sure that I got it right
any way I'm going to use regular relay ... os i will change this circuit

Title: Re:mcHF LPF switching bug?
Post by: DF8OE on 20. June 2021, 12:42:59

If you mean "monostable relay" by "regular" you have to change the driver stage of the relays and you are incompatible with firmware. Firmware provides pulse switching for bistable relays.

vy 73
Andreas