Velleman Kits & Projects

Universal, robust and compact are the key words that describe this amplifier. A stereo or a mono amplifier, with three input sensitivity settings. Overload and short-circuit protection, protection against incorrect power supply polarity and thermal protection. Speaker transient suppression.

A dedicated power supply board, designed for use with K4004B 200w Mono/Stereo power amplifier. Fitted with two reservoir capacitors (10000µf 50V), protection fuses and LED indicators. It can be used for any split rail power supply application.

Heatsink and transformer are included, ideally suited for installation into active speaker systems.

For most of us a high power valve amplifier is unaffordable. This kit changes that, so that now everybody can enjoy that sublime "valve sound". The sound of valves cannot be surpassed, neither by transistors nor FETs. In the development process, special attention was given to the housing so that the expensive valves are displayed in a visually attractive manner. The most vulnerable point of a valve amplifier are the output transformers; that's why we use ultra-linear and overrated output transformers (toroidal) to guarantee a rich bass response. To extend the life of the precious valves, the amplifier has a switch-on delay so that the high voltage is switched on when the valves are warmed up.

For most of us a high-power valve amplifier is unaffordable. This kit changes that, so that now everybody can enjoy that sublime "valve sound". The sound of valves has never been surpassed, neither by transistors nor FETs. In the development process, special attention was given to the housing so that the expensive valves are displayed in a visually attractive manner. The most vulnerable point of a valve amplifier are the output transformers; that's the reason why we use ultra-linear and overrated output transformers (toroidal) to guarantee a rich bass response. To extend the life of the precious valves, the amplifier has a switch-on delay, so that the high voltage is switched on when the valves are warmed up.

Stereo VU meter with 2 x 15 LEDs (dot or bar indicator) and an adjustable input. Package contents include 1 front panel suitable for horizontal or vertical mounting.

10 LED scale, up to 2000Wrms power measurements. Does not need a special power supply, because it is supplied directly from the speaker output. Ideal for car audio systems and PA systems. Also usable for bridged amplifiers. The unit can be used both horizontal and vertical. The kit comes with a front panel and four attractive front stickers, for the different scales

To process a PAL colour video signal it first has to be converted back into the original Red, Green and Blue signals. This allows the colours to be adjusted separately along with the colour intensity, brightness and contrast. Once processed the signal can be converted back into a PAL video signal. The user can choose PAL video or RGB output. In addition space is provided on the PCB for a UHF modulator ( type RFMOD) so you can use the antenna input of your TV or video. An SVHS input signal can also be connected.

This telephone amplifier may be used as a freestanding amplifier with speaker, e.g. to listen to a telephone conversation, or the output may be connected to an amplifier or mixing panel (e.g. radio stations).

This circuit does more than an ordinary running light, it not only runs in both directions, but it also flashes with two groups of lamps (flip-flop) and with all the lamps at the same time. The four light effects follow each other automatically.