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.
**broken link removed**
A picture of the prototype built on an old scrap chassis.
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Here is the signal available at the anode. With approximately 130V applied, the measured current is around 1mA.
**broken link removed**
Across the cathode resistor is shown below, maybe I could fit a buffer transistor in there somehow ?
**broken link removed**
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.
**broken link removed**
A picture of the prototype built on an old scrap chassis.
**broken link removed**
Here is the signal available at the anode. With approximately 130V applied, the measured current is around 1mA.
**broken link removed**
Across the cathode resistor is shown below, maybe I could fit a buffer transistor in there somehow ?
**broken link removed**
Any suggestions welcomed.
regards..