Re: Display driver board reality
¿ªÔÆÌåÓýNot quite that simple¡ Some, but few zeners operate at 10 MHz like the SPI clock and data signal lines do.? What you get instead is something that looks like a mountain shaped waveform.? People have learned this the hard way thinking they can use them as boas clipping diodes on RF transistors only to find that the transistors still blow up. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of bruce williams via groups.io
Sent: Friday, February 7, 2025 10:20 AM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] Display driver board reality ? Just a thought but I am no EE.? I like the guidance and list.? The only remaining issue is? ? or if you DO have the level change hardware on your display board but have not selected it ? Is it not possible to use a 3.3v zener to clamp and protect this.? This would prevent from destroying the RA8875.? ?It may be the circuit would not function properly if the zener clamps, but at least the RA chip would not be destroyed.? Then the builder can resolve by selecting the level change. ? Maybe it helps, maybe not ? |
K9HZ