Another departure

A new design by David: the tower of large LED's will be controlled by an IC that responds proportionally to a voltage input. An Op Amp front end will match inputs, for example an iPod. The short tower on the left has volume (top), tone and power controls for a solid-state amp to be built.

Air Cannon

There is not much of a connection ROV's but a fine example of a compressed-air ping pong ball cannon. It delivers very good range when charged between 40 and 60 psi. Of course the obvious question is, can we build a bigger one?

Another Application Idea

David engineered this circuit consisting of an ADI accelerometer (top) feeding an opamp with gain set to match the 2/3 Vcc operating point of the 555 timer modulation input. The 555 pwm output drives a 15 amp darlington power transistor (right) with a 12vdc incandescent lamp for a load. The circuit is perfectly balanced. Our plan is to secure the accelerometer underneath our trampoline with light weight shock cord. The result is lighting that responds to the users bouncing and jumping.

Better Soldering Work

David sent this to me via his phone to show how much better he did (2) at soldering an accelerometer on to an adapter board than I did (1).

Power

You can never have too much power......

Electron Beam Deflection

As part of our investigation of electron tubes, we have a small CRT (bottom center) to experiment with. We have 5KV (right meter) for the second anode supplied from a cable tester (large black box). The two white dots on the screen are a result of driving a single deflection coil with a 555/power transistor circuit. Note the small stream of smoke in the lower right corner as we exceed the power capacity of a current limiting resistor.

Revised Pressure Chamber Design

Here's the revised design for the pressure chamber with a cable bulkhead. Cables will first enter the the cable bulkhead via a water proof seal. Connections to the pressure chamber will be via sealed connectors.

Proposed Dome Mount Design

This shows the current design to mate the acrylic dome to the body of the pressure chamber. A double seal would be formed with a gaskets (not shown) under the ring and under the flange of the dome.