I've been working on a little novelty project to combine the two types of technology. Just wondered if anyone had any safe suggestions on how to interface the crystal oscillator to a pic CLKIN pin.
Here's what I have so far. The oscillator circuit was borrowed from an old shortwave receiver. The main difference between the circuit below and the actual prototype is the inclusion of a 1.5k resistor in the cathode. The tube used is the nearest equivalent I could find.
A picture of the prototype built on an old scrap chassis.
Here is the signal available at the anode. With approximately 130V applied, the measured current is around 1mA.
Across the cathode resistor is shown below, maybe I could fit a buffer transistor in there somehow ?
Any suggestions welcomed.
regards..
Here's what I have so far. The oscillator circuit was borrowed from an old shortwave receiver. The main difference between the circuit below and the actual prototype is the inclusion of a 1.5k resistor in the cathode. The tube used is the nearest equivalent I could find.

A picture of the prototype built on an old scrap chassis.

Here is the signal available at the anode. With approximately 130V applied, the measured current is around 1mA.

Across the cathode resistor is shown below, maybe I could fit a buffer transistor in there somehow ?

Any suggestions welcomed.
regards..