Welcome to my "Technical" blog website.
You may be visiting this blog site after selecting the "Technical" link / pointer from my main blog page zs6dez.blogspot.co.za
On this site, I plan to provide some technical detail of items in which I have been involved with whilst busy with my Amateur Radio journey / hobby.
I do hope the information contributes to that which you may be looking for.
Any interest in the detail, please drop me a message via the contact form on the right side of this post.
Under Construction
Variable DC "Bench" Power supply
This item was recently purchased at an Amateur Radio flea-market from a person in electronic manufacturing who has excess stock at a very reasonable price. Found to be a most popular purchase.
The power supply is supplied as a kit and was packaged to include two analogue meters of your choice, a set of terminal posts and extra resistors permitting your choice of building either a 0-15V 5A DC power supply or a 0-35V 3A DC power supply. I opted for the 0-15V 5A DC option.
The end user has to supply an appropriate transformer meeting the required current as well as an enclosure to house the electronics. Specifications of the transformer are included with the building instructions
The circuitry provides a very stable output voltage and includes current limiting protection.
The only modification done by me was to raise the heat sink approx 4mm above the circuit board and this required the use of longer screws to mount the power transistor.
Final task is to now install the transformer and electronics in an enclosure and mount the terminal posts and meters.
Nice small "bench" power supply for my electronics projects. Doubt I would ever exceed 5 Amp and if I do I still have my radio power supply of 35 Amp.
The power supply is supplied as a kit and was packaged to include two analogue meters of your choice, a set of terminal posts and extra resistors permitting your choice of building either a 0-15V 5A DC power supply or a 0-35V 3A DC power supply. I opted for the 0-15V 5A DC option.
The end user has to supply an appropriate transformer meeting the required current as well as an enclosure to house the electronics. Specifications of the transformer are included with the building instructions
The circuitry provides a very stable output voltage and includes current limiting protection.
The only modification done by me was to raise the heat sink approx 4mm above the circuit board and this required the use of longer screws to mount the power transistor.
Final task is to now install the transformer and electronics in an enclosure and mount the terminal posts and meters.
Nice small "bench" power supply for my electronics projects. Doubt I would ever exceed 5 Amp and if I do I still have my radio power supply of 35 Amp.
Analogue Panel Meters
Panel Meters
These items were recently purchased at an Amateur Radio flea-market from a person in electronic manufacturing who has excess stock at a reasonable price.
The seller also has more meters of the same brand and with other display ranges.
These items were recently purchased at an Amateur Radio flea-market from a person in electronic manufacturing who has excess stock at a reasonable price.
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| SD-640 Panel meter |
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| SD-460 Panel meter |
The seller also has more meters of the same brand and with other display ranges.
12 button Keypad
12 button Keypad
This item was purchased at an Amateur Radio flea-market from a person in electronic manufacturing who has excess stock at a reasonable price. No detail of the internal wiring was available however I have since opened a keypad, worked out the connection detail and provide the circuit detail below.
This item was purchased at an Amateur Radio flea-market from a person in electronic manufacturing who has excess stock at a reasonable price. No detail of the internal wiring was available however I have since opened a keypad, worked out the connection detail and provide the circuit detail below.
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| Keypad: 13 pin connection at bottom (left-to-right) |
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| Circuit drawing: n/c = no connection |
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