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[20] [21] The continuation of the integration trend (printed circuit boards, integrated circuits, etc.), and mass production of electronics (especially computer manufacturing overseas and plug-in modules) eroded the basic Heathkit business model. Assembling a kit might still be fun, but it could no longer save much money.
These never gained much popularity because only a bare printed circuit board was made available and builders had to gather up a large number of components. [specify] In 1983, the Tucson Amateur Packet Radio (TAPR) association produced complete kits for their TNC-1 design. This was later available as the Heathkit HD-4040.
Some electronic kits were assembled to make complete complex devices such as color television sets, oscilloscopes, high-end audio amplifiers, amateur radio equipment, electric organs, [2] and even computers such as the Heathkit H-8, and the LNW-80. Many of the early microprocessor computers were sold as either electronic kits or assembled and ...
A Heathkit amateur radio transmitter circa 1969, with external VFO. A variable frequency oscillator (VFO) in electronics is an oscillator whose frequency can be tuned (i.e., varied) over some range. [1] It is a necessary component in any tunable radio transmitter and in receivers that work by the superheterodyne principle.
Postwar, 1625 tubes flooded the surplus market, and were available for pennies apiece. Surplus 1625s found some commercial use, notably the use of a pair as modulator tubes in the Heathkit DX-100 amateur transmitter. The HY-69 is an 807 variant with a 5-pin base and a directly heated filamentary cathode operating at 6.3 V, 1.6 A.
A successor model, the "All-in-One" Heathkit H89, combines a Z80 processor board and a floppy disk drive into the cabinet of an Heathkit H19 terminal. This model also was sold in fully assembled form as the WH89. These were later sold by Zenith Electronics with their name on the front as the Zenith Z-89. Heathkit H8 (right) and H9 video ...
Circuit diagram of a single-ended triode The overwhelmingly dominant circuit topology during this period was the single-ended triode gain stage, operating in class A, which gave very good sound (and reasonable measured distortion performance) despite extremely simple circuitry with very few components: important at a time when components were ...
Two Heathkit Grid Dip Meters with a set of tuning coils. The dip meter can be used either to measure the relative power lost to a nearby circuit (in which case the amplitude shown on the meter "dips") or to measure the relative power absorbed from a nearby powered circuit (in which case, the meter amplitude peaks). In either mode of operation ...