Link to first post about 40m NE602 DC RX
The original 40m DC RX was built to evaluate the NE602 mixer circuit. This was 1987 and I received a free sample of the NE602 on a blister card. It looked very useful, because it had the oscillator and double balance mixer all in one chip. I quickly learned that NE602 overloaded very easily but I still built a receiver up just for fun. draft article submission from 1987
Here's a photo of the original 1987 NE602 RX. It was housed in a Radio Shack cabinet, using a vernier dial for tuning, and volume and phone connections on the front panel. The 9V battery was inside the cabinet, and the antenna connection was through an RCA phono connector through the back panel.
Below is a photo of the interior of the RX. Click to enlarge.
The original circuit board was single sided, as shown below in a view from the component side. Click to enlarge.
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